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

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View PDF at GPO Pt. 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 2013-07-01

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.

  • 2014-04-28; vol. 79 # 81 - Monday, April 28, 2014
    1. 79 FR 23414 - Control of Air Pollution From Motor Vehicles: Tier 3 Motor Vehicle Emission and Fuel Standards
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective on June 27, 2014. The incorporation by reference of certain publications listed in this regulation is approved by the Director of the Federal Register as of June 27, 2014.
      40 CFR Parts 79, 80, 85, 86, 600, 1036, 1037, 1039, 1042, 1048, 1054, 1065, and 1066

Title 40 published on 2013-07-01

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

  • 2014-04-28; vol. 79 # 81 - Monday, April 28, 2014
    1. 79 FR 23414 - Control of Air Pollution From Motor Vehicles: Tier 3 Motor Vehicle Emission and Fuel Standards
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective on June 27, 2014. The incorporation by reference of certain publications listed in this regulation is approved by the Director of the Federal Register as of June 27, 2014.
      40 CFR Parts 79, 80, 85, 86, 600, 1036, 1037, 1039, 1042, 1048, 1054, 1065, and 1066