>>SmartWay
Transport Partnership
U.S. ENVIRONMENTAL PROTECTION AGENCY
Interim Requirements to Determine
Eligibility of SmartWay Tractors
Sum may of SmartWay
Tractor ft Trailer
Program
U.S. Environmental Protection
Agency Certified SmartWay trac-
tors and trailers are a new genera-
with cleaner, fuel-saving
features. SmartWay tractors and
trailers can achieve fuel savings
of 10 to 20 percent (saving car-
riers between 1,700 and 3,300
gallons of diesel fuel annually),
lower greenhouse-gas emissions,
and significantly reduce oxides of
nitrogen, particulate matter, and
other air pollutants.
This document describes the
interim requirements (both design
and performance) for adding
tractors to the existing list of
SmartWay certified trucks.
Purpose of Interim Requirements
The US Environmental Protection Agency (EPA) developed these interim
requirements to determine eligibility for SmartWay certification of Class 8
sleeper-cab tractors.1 These interim requirements are intended to permit
truck manufacturers to add SmartWay-certified sleeper-cab tractor models
to the current list of SmartWay-certified Class 8 tractors.2 Using these
interim requirements, tractor models not previously considered for Smart-
Way designation can be evaluated, as can any eligible Class 8 sleeper-cab
tractor. These interim requirements replace all prior EPA guidance and
direction to truck manufacturers and truck purchasers on how to determine
eligibility for SmartWay-certified tractors.
Specifics of Interim Requirements
To be eligible for SmartWay certification, a tractor must be a Class 8
sleeper-cab tractor and meet the following design, performance and licens-
ing requirements:
Design Requirement:
New model (newly introduced into commerce); not a retrofit
Sleeper cab intended for over-the-road line haul operation
Aerodynamic profile (sloping hood, curved features). No "classic-style"
tractors (long nose, flat hood, flat, squared-off grill) will be considered
eligible even if they meet other requirements
Equipped with the following components and features:
1. 2007 or newer EPA-compliant engine, as determined by federal
emissions certification testing
2. Roof fairing attached to the cab roof that extends the uppermost
height of the integrated cab roof and fairing to approximately at or
above the height of a typical (53' L x 102" W x 13'6" H) dry box van
semi-trailer when such a trailer is attached to the tractor, to help
maintain smooth air flow across the top surface of the combined
1 This method is an interim method, in effect until the US Environmental Protection Agency (EPA) finalizes a more comprehensive
greenhouse gas emissions test protocol for medium duty and heavy duty commercial on highway vehicles. When the more comprehensive
test protocol is finalized, EPA plans to establish new performance-based eligibility criteria for SmartWay certification of Class 8 sleeper-cab
tractor-trailers using the new more comprehensive test method. EPA will consider using the finalized test protocol to expand SmartWay
certification to other truck configurations and classes.
2 EPA initially limited each truck manufacturer to two (2) SmartWay-certified Class 8 sleeper-cab tractor models in each truck make
(brand). The initial SmartWay-certified models were selected on the basis of their fuel efficiency. To be eligible, a manufacturer had to
confirm to EPA that the model or models were the most fuel-efficient model or models offered in that truck make. A manufacturer evaluated
the fuel efficiency of its truck models using industry-accepted test methods, including the Joint TMC/SAE J1321 Fuel Consumption Test
Procedure Type II RP J1321; the TMC RP 1109 Type IV Fuel Economy Test Procedure; computational fluid dynamics (CFD) modeling;
and wind tunnel testing. Additionally, the models had to be equipped with the following features: 2007 or newer EPA-compliant engine, as
determined by federal emissions certification testing; integrated roof fairing; cab side extender fairings; side fuel tank fairings; aerodynamic
mirrors; aerodynamic bumper; low rolling resistance EPA-verified tires; aluminum wheels encouraged, but not required; and an idle
reduction system capable of providing eight (8) or more continuous hours of idle-free operation for the main truck engine.
SmartWay Transport | EPA-420-F-09-045 | www.epa.gov/smartway | 734-214-4767 | smartway_transport@epa.gov
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tractor and trailer ("integrated roof fairing").3
3. Fairings that extend back from the sides of the
cab to help maintain smooth air flow across the
tractor-trailer gap ("cab side extender fairings").
4. Fairings that cover the side fuel tanks to help
maintain smooth air flow over the fuel tanks
("side tank fairings").
5. Mirrors with a curved housing to help maintain
smooth airflow over the mirrors ("aerodynamic
mirrors").
6. A bumper that curves inward at the bottom and
sides, to help maintain smooth air flow under and
around the tractor ("aerodynamic bumper").
7. Low rolling resistance EPA-verified low rolling
resistance tires.4
8. Idle reduction system capable of providing eight
(8) or more continuous hours of idle-free opera-
tion for the main truck engine.5
Aluminum wheels and other light-weight components
are encouraged, but not required.
2. Performance Requirement
The tractor must demonstrate that it meets or ex-
ceeds the fuel efficiency performance of at least
one current SmartWay-certified sleeper-cab tractor
model, of any make from any manufacturer.
To demonstrate that a tractor meets this fuel effi-
ciency requirement, it must be tested using the Joint
TMC/SAE J1321 Fuel Consumption Test Procedure
Type II RP J1321, as modified by EPA (see below).
No other means of vehicle evaluation is acceptable.
The SAE J1321 test must be conducted according to
EPA's interim J1321 Test Method.
The make and/or manufacturer need not match that
of the candidate tractor. However, EPA must approve
of the reference tractor / candidate tractor configura-
tions.
The manufacturer must have its test plan approved
by EPA prior to testing.6
The manufacturer must share raw test data, as well
as other test information (test conditions, test meth-
od, test facility, comparison tractor, etc.) with EPA as
part of its submission for SmartWay certification.
EPA reserves the right to disregard tests that it
judges to be invalid because the conduct of the test,
or the test facilities, conditions, test equipment, or ve-
hicles fail to meet the provisions of the test method or
3 Actual trailer height from the ground to the roof of the trailer depends upon a combination of factors
including trailer dimensions, fifth wheel setting, wheel and tire size, etc.
4 A list of SmartWay-verified low rolling resistance tire models is available at:
http: //www. epa.gov/sm artway/transport/what-sm artway/verified-technologies .htm#tires
5 The truck purchaser can choose the manufacturer-offered idle reduction system or an EPA-approved
alternative. The purchaser must demonstrate to EPA that the alternative option provides eight (8) or more
continuous hours of idle-free operation.
6 Test plan submissions, questions, and test results can be sent to SmartWay-tech@epamail.epa.gov
EPA's supplemental test guidelines, or because EPA
determines that the reported results are incompatible
with good engineering judgment.
Licensing Requirement
Once EPA determines that a sleeper-cab tractor
model is eligible for SmartWay certification, the man-
ufacturer must submit a request to EPA to license the
model as a SmartWay-certified vehicle.
If a truck owner wants to display an external Smart-
Way logo on a SmartWay-eligible sleeper-cab tractor,
the truck owner must complete a separate logo
request and equipment check list with EPA.
Right of Exclusion
EPA reserves the right to withhold SmartWay certifica-
tion if in its estimation the proposed truck model does not
meet these design, performance, or licensing require-
ments.
Further Information
For general information about SmartWay and
SmartWay-certified tractors and trailers, visit the EPA
SmartWay web site at www.epa.gov/smartwav.
For further information related to these interim
eligibility requirements and the interim test method
for SmartWay certification of sleeper-cab tractors,
contact the SmartWay technical e-mail center at
SmartWav-tech@epamail.epa.gov.
Contact EPA
Interested organizations should contact SmartWay prior
to testing.
To contact EPA,
send an e-mail to: SmartWav-tech@.epa.gov
telephone the SmartWay Transport Partnership Call
Center at (734) 214-4767
write to SmartWay Transport Partnership, US EPA,
2000 Traverwood, Ann Arbor, Ml 48105.
If you have questions regarding SmatWay Certified
Tractors and Trailers or SmartWay verified technologies,
contact the SmartWay Technology Team at:
SmartWav-tech@.epa.gov.
SmartWay Transport | EPA^120-F-09-045 | www.epa.gov/smartway | 734-214-4767 | smartway_transport@epa.gov
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