40 CFR Part 86, Appendix V to Part 86 - The Standard Road Cycle (SRC)

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View PDF at GPOPt. 86, App. V
Appendix V to Part 86—The Standard Road Cycle (SRC)
1. The standard road cycle (SRC) is a mileage accumulation cycle that may be used for any vehicle which is covered by the applicability provisions of § 86.1801. The vehicle may be run on a track or on a mileage accumulation dynamometer.
2. The cycle consists of 7 laps of a 3.7 mile course. The length of the lap may be changed to accommodate the length of the service-accumulation track.
Description of the SRC
Lap Description Typical accel rate(MPH/s)
1 (start engine) Idle 10 sec 0
1 Mod accel to 30 MPH 4
1 Cruise at 30 MPH for 1/4 lap 0
1 Mod. decel to 20 MPH −5
1 Mod accel to 30 MPH 4
1 Cruise at 30 MPH for 1/4 lap 0
1 Mod. decel to stop −5
1 Idle 5 sec 0
1 Mod accel to 35 MPH 4
1 Cruise at 35 MPH for 1/4 lap 0
1 Mod. decel to 25 MPH −5
1 Mod accel to 35 MPH 4
1 Cruise at 35 MPH for 1/4 lap 0
1 Mod. decel to stop −5
2 Idle 10 sec 0
2 Mod accel to 40 MPH 3
2 Cruise at 40 MPH for 1/4 lap 0
2 Mod. decel to 30 MPH −5
2 Mod accel to 40 MPH 3
2 Cruise at 40 MPH for 1/4 lap 0
2 Mod. decel to stop −5
2 Idle 5 sec 0
2 Mod accel to 45 MPH 3
2 Cruise at 45 MPH for 1/4 lap 0
2 Mod. decel to 35 MPH −5
2 Mod accel to 45 MPH 3
2 Cruise at 45 MPH for 1/4> lap 0
2 Mod. decel to stop −5
3 Idle 10 sec 0
3 Hard accel to 55 MPH 4
3 Cruise at 55 MPH for 1/4 lap 0
3 Mod. decel to 45 MPH −5
3 Mod accel to 55 MPH 2
3 Cruise at 55 MPH for 1/4 lap 0
3 Mod. decel to 45 MPH −5
3 Mod accel to 60 MPH 2
3 Cruise at 60 MPH for 1/4 lap 0
3 Mod. decel to 50 MPH −5
3 Mod. accel to 60 MPH 2
3 Cruise at 60 MPH for 1/4 lap 0
3 Mod. decel to stop −4
4 Idle 10 sec 0
4 Hard accel to 80 MPH 3
4 Coastdown to 70 MPH −1
4 Cruise at 70 MPH for 1/2 Lap 0
4 Mod. decel to 50 MPH −3
4 Mod accel to 65 MPH 2
4 Cruise at 65 MPH for 1/2 lap 0
4 Mod. decel to 50 MPH −3
5 Mod accel to 75 MPH 1
5 Cruise at 75 MPH for 1/2 lap 0
5 Mod. decel to 50 MPH −3
5 Lt. accel to 70 MPH 1
5 Cruise at 70 MPH for 1/2 lap 0
5 Mod. decel 50 MPH −3
6 Mod accel to 70 MPH 2
6 Coastdown to 60 MPH −1
6 Cruise at 60 MPH for 1/2 lap 0
6 Mod. decel to 50 MPH −4
6 Mod. accel to 65 MPH 1
6 Cruise at 65 MPH for 1/2 lap 0
6 Mod. decel to stop −4
7 Idle 45 sec 0
7 Hard accel to 55 MPH 4
7 Cruise at 55 MPH for 1/4 lap 0
7 Mod. decel to 40 MPH −5
7 Mod. accel to 55 MPH 2
7 Cruise at 55 MPH for 1/4 lap 0
7 Mod. decel to 40 MPH −5
7 Mod. accel to 50 MPH 2
7 Cruise at 50 MPH for 1/4 lap 0
7 Mod. decel to 40 MPH −5
7 Mod. accel to 50 MPH 2
7 Cruise at 50 MPH for 1/4 lap 0
7 Mod. decel to stop −5
The standard road cycle is represented graphically in the following figure:
[71 FR 2837, Jan. 17, 2006]

Title 40 published on 2015-07-01.

The following are only the Rules published in the Federal Register after the published date of Title 40.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2015-07-28; vol. 80 # 144 - Tuesday, July 28, 2015
    1. 80 FR 44863 - Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles—Phase 2; Notice of Public Hearings and Comment Period
      GPO FDSys: XML | Text
      DEPARTMENT OF TRANSPORTATION, ENVIRONMENTAL PROTECTION AGENCY, National Highway Traffic Safety Administration
      Notice of public hearings; extension of comment period.
      NHTSA and EPA will jointly hold a public hearing on Thursday, August 6, 2015, beginning at 9:00 a.m. local time, and a second hearing on Tuesday, August 18, 2015, beginning at 9:00 a.m. local time. EPA and NHTSA will make every effort to accommodate all speakers that arrive and register. Each hearing will continue until everyone has had a chance to speak. If you would like to present oral testimony at one of these this public hearings, please contact the person identified under FOR FURTHER INFORMATION CONTACT by August 3, 2015, for the first hearing, or by August 11, 2015, for the second hearing. In order to provide commenters 30 days after the last public hearing, the comment period for the proposal is being extended through September 17, 2015.
      40 CFR Parts 9, 22, 85, 86, 600, 1033, 1036, 1037, 1039, 1042, 1065, 1066, and 1068

Title 40 published on 2015-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR Part 86 after this date.

  • 2015-09-08; vol. 80 # 173 - Tuesday, September 8, 2015
    1. 80 FR 53756 - Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles—Phase 2; Extension of Comment Period
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, ENVIRONMENTAL PROTECTION AGENCY, National Highway Traffic Safety Administration
      Proposed rule; extension of comment period.
      The comment period for the proposed rule published July 13, 2015 (80 FR 40139) is extended. Written comments for both documents must be received on or before October 1, 2015.
      40 CFR Parts 9, 22, 85, 86, 600, 1033, 1036, 1037, 1039, 1042, 1065, 1066, and 1068