550/9-74-010
ENVIRONMENTAL NQISE MEASUREMENTS
    QN INTERSTATE 57 DURING AND
        AFTER TRUCK STRIKE
       JUNE W4
       QFFIGE OF NOISE ABATEMENT
            AND CONTROL

          Washington, P.
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The  contents  of this report  are not  to be used for advertising, publication,  or pro-
motional purposes. Citation of trade names does not constitute an official indorsement
or approval of the use of such commercial products. The findings of this report  are not
to be construed  as an official  Department of the Army position, unless so designated by
other authorized documents. This document is available in limited quantities through
the U.S. Environmental Protection Agency,  office  of Noise  Abatement and Control,
Room 1128,-Crystal Mall #2,  192I.Jefferson Davis Highway, Arlington, Virginia 20460.

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                                     5 50/9-74-010
ENVIRONMENTAL NOISE MEASUREMENTS
     ON fNTERSTATE 57 DURING AND
           AFTER TRUCK STRIKE
                      by
                  P. 0. Schomer
                  B. L. Homans
               JUNE  1974
           OFFICE OF NOISE ABATEMENT
                AND CONTROL

              Washington, D.C. 20460
  Report Prepared under Agreement between Environmental Protection
  Agency, Office of Noise Abatement and Control and Construction
  Engineering Research Laboratory of the U.S. Department of the Army

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                               FOREWORD

    The nationwide independent truck drivers' strike of February 1974, afforded
a unique opportunity to ascertain the noise impact of trucks on highway noise.
For an approximate one-week period beginning February 1, truck traffic—a
major contributant to highway noise-—was curtailed as between 100,000 and
200,000 independent truckers went on strike.
    In response to the impending strike, EPA's Office of Noise Abatement and
Control sought the collection of data during and after the strike in order to
quantify the impact of truck traffic to overall highway noise.  EPA assigned
the task to the Construction Engineering Research Laboratory (CERL) of the
U. S. Army Corps of Engineers.  Acting under interagency agreement with
EPA, CERL measured highway noise along Interstate 57 between Champaign
and Rantoul, Illinois.  Data collection, which began February 1, lasted two
weeks thus including approximately equal periods of strike and poststrike
(i.e. normal) conditions.
    To permit the calculation of day, night, and day-night equivalent energy
sound levels, noise data, classified according to level, were collected daily at
7 am and  10 pm. With the assistance of the State of Illinois Highway Office,
traffic count data were simultaneously collected.

FINDINGS
    Although data were limited, a very definite increase in  equivalent sound
level and  traffic flow were observed for the period of February 9 to 11 (the
post-strike period). The increase, which was 4dB for the day-night level, is

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believed to be caused by the truck contribution to the noise environmental for
the following reasons:
     1.   The increase in night level was greater than that for daytime level.
         Trucks constitute a higher percentage of nightime traffic than daytime
         traffic.
     2.   The statistical distributions show a larger increase for higher energy
         levels after strike settlement than do the middle or lower levels. This
         contribution would come primarily from trucks.
     While it is realized that more quantitative results would have required a
well planned comprehensive monitoring program,  this rather small program
has illustrated that trucks significantly impact on highway noise.  Because of
its importance, EPA is pleased to make the following CERL report available
to the public.
                                                      Alvin  F.  Meyer
                                                      Deputy Assistant Administrator
                                                         for Noise Control Programs

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                        TABLE OF CONTENTS

                                                                  Page
BpekfTcup-d	     •*•
Purpose	     *
                                  	     1
Scope 	
Procedure	     •*•
                                                                    2
Data	     5
Results	     59

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    ENVIRONMENTAL NOISE MEASUREMENTS ON INTERSTATE 57
                DURING AND AFTER TRUCK STRIKE

BACKGROUND
    Environmental noise has been shown to be an adverse factor in the health
and welfare of our society.  Vehicle noise, and notably truck noise, is con-
sidered a major source of environmental noise.  The recent truck strike of
February 1974 with its corresponding decrease in truck traffic on interstate
highways offered a unique opportunity for correlating truck traffic with envir-
onmental noise.

PURPOSE
    The purpose of these measurements was to measure the "environment
noise" near Interstate 57 in Illinois both during and after the truck strike in
order to, if possible, correlate the decreased truck traffic with the decreased
level of environmental noise.

SCOPE
    Measurements were made of the acoustical distribution of the A-weighted
noise level at a rural location along Interstate 57 between Champaign and
Rantoul,  Illinois, for a continuous period of 14 days.  Simultaneous measure-
ments were made of the traffic flow on the two sides of the freeway.

PROCEDURE
    Two B&K Model 166 Environmental Noise Classifiers were used.  One was
set for the range 45 to 75 dBA, ,and the other was set for the range 70 to 100
dBA.   A single microphone witti v/ind screen on a tripod at an elevation of
1.2 meters above the ground  surface (B&K Model 4117) simultaneously fed the

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two classifiers.  Electric power was brought to the classifiers over a 230-
meter extension cord which was run from the nearest structure.  The traffic
measurement units were the standard unit used by the State of Illinois, Depart-
ment of Transportation.  Both the traffic counters and the classifiers were
checked and read at 7:00 a.m.  and 10:00 p. m. of each day, including weekends.
Calibration was performed on the classifiers during each checking period,
using a suitable single frequency calibrator.

SITE
     The general location of the site is shown in Figure 1.  It is approximately
midway between Champaign and Rantoul, Illinois  on the east side of Interstate
57.  The northernmost corner of the State of Illinois truck and snow plow com-
pound was used to house the equipment in a secure area.  Figure 2 is a more
detailed rendering of the actual site.   It should be noted that the area in which
the equipment and microphone was placed was a park-like setting and that the
closest highway equipment was more than 110 meters from the measurement
microphone.  The microphone  itself was located  20 meters from the center of
the nearest line of traffic.  Figure 2 also shows the general distances for the
interstate highway.

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CO
                2 km to Math is Ave.
                  Champaign
                    3km
                      I
                                           1/2 km
                                           I
t
                                          1/2 km
                                           \
                                                                     1-57 Southbound
                                                                      1-57 Northbound -
                                                                        State Highway Compound
                                                 Figure 1.  General Site Plan

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                                                                 15.24




                                                                    7.3




                                                                 19.8




                                                                 To.30
Figure 2.  Detailed Site Plan

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DATA
    The following is a compilation by days of the raw and reduced date.  For
each day, the raw data during the daytime period (7a.m. to 10 p. m.) and the
raw data during the nightime period (10 p.m. to 7 a.m.)  is given.  The traffic
count during the day and night and the calculated Leq during the day and night
are shown along with L^ for that day. Following this information for each
day and night is a graph of the levels recorded on the statistical distribution
analyzers.  Due to the weather, traffic counts could not be made during the
entire period.  Light snow and  its associated snow plowing precluded the use
of rubber tube sensors across the highway surface during plowing.  Thus,
traffic count data is available only for a few days shortly after the beginning
of the measurement period (as  soon as we were able to obtain equipment  from
the state) and during the end of the measurement period  (it snowed during the
middle of the measurement period).

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           LEVERETT BOAD VEHICLE MEASUREMENTS
           TeitKo..
51
1*5-
VI
       HI-
       60
57-
60
£7-
•ro
       5-0-
             fro-
70*

7Z
4SdBA
          J
      S*-
      5-5"
Bi
                                  Tin*.
                  DlMtM
            TO-

            7*
                  to-
                  S2
95
                         87
97
            T7-
            90
                               T»dBA
       Wind Direction


       Wind Speed


       Tcmpcniun


       Wullwr Candllloni
                      Raw Vehicle Ceuit Nertkbound


                      Raw Vehicle Ceumt Southbound

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               LEVERETT ROAD  \EHICLE MEASUREMENTS
o.o
00
45 dBA
               Test No..
/0-2
/.v
O.O
?.<»
/.2
0.0
2.0
0.3
OjQ
•4.1
A.I
0.0
                         mlnutu            TOdBA  1^32 •?  |
         Wind Dlrnllan

         Wind Speed

         Temperature

         WeiiStr CendtltaiisGiSSC
 NB
10-14
 32
Raw Vehicle Count Northbound

B«r Vehicle Count Southbound

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       140
                                                         Rndingl
       120
      100
00
       60
       40
        20
                                40         60         60         70          80         90
                                                           dBA

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              LEVEHETT ROAD VEHICLE MEASUREMENTS
              Teat NO..
                             Oat*
97.6
2.3
       to*
               SD.o
               7.3
«5dBA   |  53.^-3 | mtnutae


1.*
2.1
0.0
«
1.7
o.|
2.3
0.1
0.0
5.6
O.I
o.|
                                       TOdBA  |5"3Lfei3
        Wind Direction
        Wind Speed
        Temperature
        Weather Condition!
                                    Raw Vehicle Count Narthbouad
                                    Raw Vehicle Count Southbound
                                                              it .15"

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140
120
100
 80
 GO
 40
 20
                                           Reading 2|
[J
                                         Jl
                     40        50        60       70        80       90
                                            dBA

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             LEVERETT nOAO VEHICLE M EASUR E H EXTS
             TcttNoi.
12.*
57.7
        T7.-2
73-9
                       UI.7
37.*-
«3dBA
                                                2/57


M.1
33
0.1
21.2
3.4
o.|
H*
0.7
0.0
WdBA | 9OI. f
90
0-3
0.0
mtauui
        Wind DlraetlaB    ^**"
        WlodSpnd
        Temptntur*
        Wctttar Cendltlow
                     R*v Vehicle Count Naithbound
                     Raw VchteU Count Soatkbound
                     L^
                     Ld.
                                11

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     140
                                                Heading 3
     120
     100
      80
to
      60
u:
      40
      20
                           40        50        60        70        80        90
                                                  dBA

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               LCVERETT ROAD VEHICLE MEASUREMENTS
               TMtRe.
Ji _
p ™ •
O.(0
5/b
M*
•2.0

9.0
5.1
7.^
8.0
2,3
I.I
11-9
3.*
1.9
4SdBA
                                              —
                                                   0700
                        mtaatm
/.o
0.2
o.o
o-<&
02
00
0.-5
0-1
o.o
TOdEA | 5$'^
on
00
0.0
atarntn
         Wind DtroelloD



         Wind Speed



         T*ep*Ktun



         VTMltei Conditions
                 Ratr Vehicle Count Kertbiwund



                 Itaw Vchlato Catmt goilltfcauiul
                                   13

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   140
                                                         Reading 4i
   120
   100
    80
I





j
    60
    40
    20
                                                           dBA

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              LEVERETT ROAD VEHICLE MEASUREMENTS
              Tcit No.
                              Date'
0.0
5o.|
        $*•!>
313
;.9
oo
ifc.-/
•2.3
00
*/.?
O.fc
0.1
7.3
0.3
1
o.o
49dBA    \  S6S-3 I mlmte*            TOdBA   j  ff6^»3 |  mlnutei
Wind Direction     N NW
Wind Speed       ^* '**
Tenpcrature
Weather Condition**
                                      Raw Vehicle Count Northbound
                                      Raw Vehicle Count Southbound
                                                               -74f.42
                                  15

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140
                                                       Raiding 5|
120
100
 80
 60
 40
 20
                                 I
                           40          50          60          70          80          90
                                                        dBA

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              LtVERETT ROAD  VEHICLE  M E ASUfl E M E.XTS
              Tut No..
 0.0
3.3
        19.2
       /o.c>
4idBA
j ^|l- ^  I
                        nlmtn


10. 1
*S
a/
9.7
3./.
0.0
2,r
/.o
0.0
TO dBA | •Qf 1* I
5-r
0-5-
o./
mlautci
         Wind Dtnctlon
         WlndSprad
         Wrathtr Condlllnu
                             Raw Vohleto Count Northbound
                             Raw Vehicle Court Southbound

                             Ld.
                                 17

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                                         173.4       Raading 6,
      100
ot>
       GO
       40
tfl
       20
                             40        50        60        70         80         90
                                                      dBA

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            LEVCRETT ROAD VEHICLE MEASUREMENTS
            TwtNo..
                          DIM
60.1
       too.
                     121.9
45.1
45dBA
        j  P Sv ' O
                                        Time
6*
                                    0.0
                                           31.7
                                            0.0
2.0
                             O.f
                       OJ
                                     lOdflA
                                            j  ^^8-0  I
        Wind Dtracllon
                      fo-S
        Wind Speed



        Temperature



        Weather CondltioasQSSI-
                                  B«w Vehicle Count Korthboaod



                                  Raw Vehleta Count SoutMKiuod
                              19

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       140
                                                             Reading 7;
       120
       100
        80
to
o
        GO
        40
        20
                                  40          SO          60          70          80          90


                                                               dBA

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              LEVER ETT ROAD VEHICLE MEASUREMENTS
              Test No..
                             Date
0.9
-2O.I
7*9
                7,7
                       7,3
                                            Time ,
                                                  >70C>
2.0
1.5
0.0
1-9
1.2
0.1
0£
0-3
o./
TOdBA 1 "349.3
*.«
0.1
0.0
•InaUi
         Wind Dlrcctln
         Wind Speed
         Temperature
         Weather Conditions
               12 -Jt>
                21
Bmw VcbUlc Count Northbound
B» Vehicle Count Southbound
                                  21

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        140
                                                              Reading 8!
       120
       100
     .  80
to
to
        60
        40
        20
                                   40          50
70          80           90
                                                                dBA

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       LEVERCTT ROAD VEHICLE MEASUREMENTS
       Test Ho.
w
12 -S
Hl.f
21.2

son
stf
•33-S
4»dBA j H*
«V>
**.!
S-3
T7.7
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/7,3
3" O | mlButu


/A2
2.3
O.I
75"
2.^L
0.0
/.A
0-5
0.0
TOdM | ^33- S
Wind Direction      C^
Wind Speed         f'f
Temperature       ^~

Weather CondlUouClC9£.
Rmw Vehicle Count Northbound
Raw Vehlelo Count Southbound
Le,
Ld.
                           23

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140
                                                           91
1»
100
                                      60

-------
              LEVERETT BOAD VEHICLE  MEASUREMENTS
              TMtNo.
130.1
60S
3?.?
lift

330

-------
      140
                                                     Reading 10 i
      120
      100
       80
to
       GO
       40
Iff
    \T
                             40         60         00        70         80        90
                                                      dBA

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               LEVERET!  ROAD IEIIICLE MEASUREMENTS
               Teat No..
                               Date
3f?3
         37.3
I7.C
                         29.3
45dBA


19.9
«.o
0.1
19.7
•3.7
0.7
+*
I.I
0.1
TO dBA | *f3l' 1
tl.L
o.r
o.O
minutes
         Wind Direction
         Wind Speed
         Temperature
         WeatlicrCoodltlooi
          ll
Raw Vahtcl* Count Northbound
Raw Vehicle Count Southbound
l«.
Lda
                                   27

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     140
                                            Reading 111
     120
     100
    .  80
to
00
      80
      40
                                               Lr
      20
                                                        Lr
                         40        GO       60       70        80        90

                                              dBA

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             LEVERETT nOAD VEHICLE MEASUREMENTS
             TectKo.
                          DiU
23*
11.5
70.3
£7.7
31 .fc
rjoo
       5-2/2
       35.1
T7.0
      UH.
4ftdBA
                                        Time
                                             •X2.2O
34.7
                    o-/
                     9o
9.3
                                    TOdBA
                                   0-0
                                                        mlnutn
Wind Direction    /Vfe
Wind Speed
Temperature
Weather Condition* '
                                 Raw Vehicle Count Northbound
                                 Raw Vehtelo Count Southbound
                             29

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       140
                                                            Rcofing 12'
       120
       100
        80
co
o
        60
        40
        20
                                 40          GO          60          70         80          90


                                                              dBA

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             LCVCBETT ROAD VEHICLE MEASUREMENTS
                      37.0
tSdBA
                      Btoates
                                          ,.-
                                             .0727


1'.?
3.9
O.O
//,*
3/
0.0
3.*
O*fo
O» 1
tOdBA I 53*7
9.6
0.3
0.0
ninutcfl
Wind Dlrecttoa



Wind Speed



7«npcrabin



Weather Condition*
                       P" ^



                        '~  ,
Daw Vehicle Count Northbound



R«w Vehicle Count aoathbeund
                                31

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       140
                                                             Reading 131
       120
       100
        80
CO
to
        60
        40
                                                                               r
                                  40          GO          60          70          80          90

                                                               dBA

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             LEVERETT 1IOAD VEHICLE MEASUREMENTS
             TutNoi
        27.3
        II7-?
22. /
               to.l
        73J
46dBA
        Wind Olncllon


        WlndSpnd
                       mjf
                       r*B
        Weather Candlllani
                             7.3
0.0
       92
•239
               0.4
o./
                                     TOdBA
                                                          nlnutci
                   Raw VahlcU Count Honhbouad


                   Raw V
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       140
                                                          Raffing 14'
       120
       100
     .  80
w
    J
       60
        40
        20
                                40          BO         60         70          80         90
                                                            dBA

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             LEVER ETT ROAD VEHICLE  MEASUREMENTS
             THIKOL
ISdBA
               9.0
                      95.^
2.1-5
Wind Direction

Wind Speed

T'mpcntura

Weather Coadlllau
                       o
                      ^1^^
                      ^
                      •22
               9.7
                             o./
                                     9.3
0.0
                                                    0.5
0.0
                                      TOdBA
                       | 5*5 ^
0.1
                                                           minute*
            Rmw Vahlclt Count Northbound

            Rnr Vchlato Count Southhouml
                               35

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       140
                                                             Reading 15|
       120
        80
u
        60
        40
F
        20
                                  40          BO          60          70          80          90
                                                               dBA

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            LEVERETT nOAD VEHICLE MEASUREMENTS
            TntKo.
                   /fe
•B/.fc
63.9
//9.3
5-5.0
464BA
19.
      /03.3
35:4
       Wind DlnctloB
       WlndSpMd
22.5
3.7
0.1
,7.7
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04)
TC4BA 1 '
3.7
0.6
0.6
9.5-
0.3
o.o
ll.fc 1 mlmiUa
       Wniher
                   .Clear
                  Baw V«hlcl« Count northbound
                  Itaw VtMdo Coul Soolhbouod
                  L«
                  Ld.
                                              7/.3S
                            37

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      140
                                                   FUadbig16
      120
      100
      80
CO
00
       60
       40
                                                                 LT
                             40         BO        «ff        70        80         90

                                                     dBA

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      LEVERCTT HOAD \EHICLT  MEASUREMENTS
      TratHob.
                     DM*
52*
3*3
11.7
               12.5"
4ft dBA
         .7  I
25.V
                      mbmtea
4D
1.2
6.6
3.0
I.I
0.0
0.9
0.2
o./
2.2
o./
0-0
                                      TO dBA
• Wind Direction



 Wind Speed



 Temperature



 Weather Conditions
                                   Raw Vehicle Count Northbound



                                   Baw Vehicle Count Southbound
                       39

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140
                                                           17
120
100
 80
 GO
 40
                                                  fl
                          40          60         60         70          80         90
                                                      dBA

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            LEVER ETT ROAD VEHICLE
           Tilt No.
                 JSL. *»&&&*-*££.
 o.o
60.9
40.0
       3*7
             *//•<»
45dBA
       j P35u*7  I
                   mlmta
                                      /2-f
                                             2.5"
0/5
       Wind Direction



       Wind Speed



      _T«mpcTnturo



       Weather Condition*
                              Raw Viri-Mc Bras r-^1*:.—.-v"



                              nan Vehkitn CcooS ?n-.t»nwi
                          41

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       140
       120
       100
to
       60
       40
        20
                                       I
1
                                 40          SO         00          70          80         90
                                                             dBA

-------
             LEVERETT ROAD VEHICLE MEASUREMENTS
7A3
 fc.7
17.*
454JBA
            TMtNo.
                          Date
                                       Time
              5V7
              53
              0.6
O.I
      •2.0
0.7
                                  17,7
0.0
                    mlnutm
                                   TOdflA
                                                       nlautti
       Wind Dlnetlon
       Wind Speed
       Temperature
       Weather Conditions
            Raw Vehicle Count Northbound
            B» Vehicle Count Seuthbonnd
              TOO
            71.23
Clear
                            43

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140
                                               191
120
100
                                             bF
                     40       50        60        70        80        90
                                            dBA

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            LEVEBETT BOAD \CHICLE MEASUREMENTS
            Teat No.
0.0
£2
TtS
Q7.L
      2O.O
             737
            /37/
77.4
4SdBA
CXO
                   37.4
                   f.2
o./
                                TOdBA
                   a?
6.0
       Wind Direction
       Wind Speed
           ssw
            33
           Raw Vehicle Count Northbound
           Raw VehtoU COM Soothbound
       Weather Coadltlo
                          45

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       140
                                                                20
        120
       IN
OS
        40
        20
                                40          GO          00         70         00         90
                                                           dBA

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            LEVERETT ROAD VEHICLE MEASUREMENTS
            TM! Ko.
/ao
370
       532
24.2
337
21./
tao
4SdBA
       Wind Direction    ^
       Wind Speed      *!-&
       Tcmptialura     ™
       Wmlbn CoBdlUoof
             0.0
325
                    9.3
O./
 7.2
O./
a/
                                 TOdBA
                                                   otolttt
                 Raw Vehicle Count Northbound
                 Raw Vehicle Count Southbound
                          47

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        140
                                                                 Rtadhig 211
        100
•*"•
oo
        00
        40
                                   40          60           00          70           00           00
                                                                  dBA

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           LEVEBETT nOAD VEHICLE MEASUREMENTS
00
41*
1/9.2
  •>   1
                 22
                                  2/32
                                O.f
                                ai
2.0
0.1
al
                          TOdBA
Wind Dlnctloo    NNCi
              S-/0
               il
                              Raw Vehicle Count Northbound   "Zt*

                              Raw VchleU Couol Southbound  *f frl '
                           49

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  140
                                             221
  120
  100
                                       J~L
i
   20
                     40       50       80       70       00       90
                                         dBA

-------
           LCVERCTT BOAD \EIIICLE MEASUREMENTS
253
27?
4C.7
15-5
            3*3*
      25.0
71*
            V93
4tdBA  I 5*75*5. I mlaaUl
/o./
                  IS
                  
-------
      140
                                                      Rating 23|
      120
en
to
       40
                               40         50         60         70         80        90

                                                         rfBA

-------
            LEVERETT ROAD VEHICLE MEASUREMENTS
            TMIKO.
tu
             25.5
                    07-4
  0.7
         50.0
 //.&
0.6
 30i7
                      0.7
0.0
                                  TOdBA
                                                     mtnolci
       WlBdOtTMtlOO



       WladSpNd



       7«npentuTC



       WMther
Raw VchteU Count Xmbbaund



Rnr VthleU Count Saalhbouad
                          53

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       140
                                                        Rating 24 j
       120
      100
Ul
       60
       40
       20
                               40         GO         80         70         80          90
                                                          dBA

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            LCVCRETT ROAD VEHICLE MEASUREMENTS
            TtttKo.

3L2
M.7
             35.2
20-S
4104   1 $+7.7  I
       45.0
       50.9
202
7.0
0.2
0.1
       5*
                                              0.0
                                 too*
                           I SXT7.7
       Wind Mnctlea



       WladSpMd



       Tmpentnn



       WMlherCandlllaai
                 Raw Vchlelt Count Itortbbouad



                 Raw V*hlel* Couot aoBtteouad
                           55

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      140
                                                     251
      120
      100
C7I
a>
      40

                                                             J1
                           40        50        80        70        80        90

                                                 dBA

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           LEVERETT IIOAD VEHICLE ME ASUIl EM ENTS
           TMKo.
0*
7.?
37.7
547
      30.0
51.7
                              o.o
3.?
                               0.0
                        34
0.4
                        ao
0-5
            ao
                               TOdBA
       Wind DlnettOB



       Wtod Speed
       WathcrCaodlUou
                      Raw Vehicle Count Northbound



                      Raw Vehicle Count Southbound



                      L_
                                                •V9.7/
                         57

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       140
                                                                   26l
       120
       100
       80
01
oo
       40
        20
                                 40          50          60         70          80          90

                                                             dBA

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RESULTS
    The results are shown on the following graph and corresponding chart.  By
dates,  the Lgq per day and night and the L^n are plotted along with the traffic
measured in the near lane by day, by night, and total traffic. The raw data
traffic  measurements show that the flow is more or less equal in the two direc-
tions,  so the total traffic, including the far lanes, can be considered double the
traffic  flow information given in the graph and chart.
                                    59

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     80
u
   15000
   10000
                                                                                                  Leg day ID
                                                                                                  Ug Night) £
    5000
          1 Feb|  2 Feb] 3 Febl 4 Fab: \5 Feb| 6 Febll? Febl 8 Febi foFeb! 10 Feb|11 Feb 12>ab 13 Feb'14 Feb
                                                   Date)

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Date
1. Feb
2 Feb
3 Feb
4 Feb
5 Feb
6 Feb
7 Feb
8 Feb
9 Feb
10 Feb
11 Feb
12 Feb
13 Feb
14 Feb
Traffic
Flow
(Day)







9467
7848

9285

8911
9398
Traffic
Flow
(Night)




1266



1079
2396


2860
3108

Leq
(Day)
(?8.60
67.30
68. 85
69.33
67.28

70.43
70.26
66.91
75.96
70.37

71.72
71.04

Leq
(Night)
fto.lS

67.85
66.90
65.30

68.34
66.59
64.51
71.25

71.94
71.33
70.78

Ldn


74.42
72.36


75.64
73.75
71.35
78.54


77.80
77.23
Summary Results of Traffic Flow and Noise Level
61

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 BIBLIOGRAPHfC DATA
 SHEET
                  1. Report No.
. He-port No.
550/9-74-010
          3. Recipient's Accession No.
4. 1 itIc and Subtitle
 Environmental Noise Measurements on  Interstate 57
 During and After Truck Strike
                                                             5. He port Date
                                                                June 1974
                                                              6.
7. Author(s)
  P.D.  Schomer and  B.L. Homans
                                                             8- Performing Organisation Repc.
                                                               No.
9. Performing Organization Name and Address
 Construction Engineering Research Laboratory
 U.S.  Department ;of  the Army
                                                              10. Project/Task/Work Unit No.
                                                              11. Contract /Grant Mo.
12, Sponsoring Organization Name and Address   ,
 Environmental Protection Agency
 Office of Noise Abatement  and Control
 Crystal Mall #2,  1921 Jefferson Davis Highway
 Arlington,  Virginia  20460
                                                              13. Type of Report & Period
                                                                Covered
                                                                Final
                                                              14.
IS. Supplementary Notes
16. Abstracts
  Noise and  traffic-count data were  recorded and analyzed  during  and
  immediately after  a nationwide stike of independent truckers.   This
  report presents statistical noise  levels;  equivalent sound level
  (L  ), and day-night level (!•._) for a two-week  data-gathering
  perrod.  Prom these results, it is possible to infer the truck
  contribution to highway noise.
I/, Key Words and Document Analysis.  17o. Descriptors
  TRUCK NOISE,  HIGHWAY  NOISE,  L. . L
                                '   dn
                                         eq
J7b. Identifiers/Open-Ended Terms
17c. COSATI Fie Id/Group
IB. Availability Statement

 Not restricted.   Limited supply available '
 in Office of Noise Abatement and Control;
                                                   19. Security Class (Thin
                                                      Report)
                                            $P
                                            (i in
20. Srruiiiy Class (Tliis
  Page
                                                    21. No. ot
                                                                       22. I'lire
FORM NTIS-3B < IO-70I
                                                                       USCOMM-DC «' i- •

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