{"data":{"id":"us/40-cfr-appendix-v-to-part-86","jurisdiction":"us","citation":"40 CFR Appendix V to Part 86","heading":"Appendix V to Part 86—The Standard Road Cycle (SRC)","body":"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.\n2. 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.\nDescription of the SRC\nLap Description Typical accel rate (MPH/s)\n1 (start engine) Idle 10 sec 0\n1 Mod accel to 30 MPH 4\n1 Cruise at 30 MPH for 1⁄4 lap 0\n1 Mod. decel to 20 MPH −5\n1 Mod accel to 30 MPH 4\n1 Cruise at 30 MPH for 1⁄4 lap 0\n1 Mod. decel to stop −5\n1 Idle 5 sec 0\n1 Mod accel to 35 MPH 4\n1 Cruise at 35 MPH for 1⁄4 lap 0\n1 Mod. decel to 25 MPH −5\n1 Mod accel to 35 MPH 4\n1 Cruise at 35 MPH for 1⁄4 lap 0\n1 Mod. decel to stop −5\n2 Idle 10 sec 0\n2 Mod accel to 40 MPH 3\n2 Cruise at 40 MPH for 1⁄4 lap 0\n2 Mod. decel to 30 MPH −5\n2 Mod accel to 40 MPH 3\n2 Cruise at 40 MPH for 1⁄4 lap 0\n2 Mod. decel to stop −5\n2 Idle 5 sec 0\n2 Mod accel to 45 MPH 3\n2 Cruise at 45 MPH for 1⁄4 lap 0\n2 Mod. decel to 35 MPH −5\n2 Mod accel to 45 MPH 3\n2 Cruise at 45 MPH for 1⁄4\u003e lap 0\n2 Mod. decel to stop −5\n3 Idle 10 sec 0\n3 Hard accel to 55 MPH 4\n3 Cruise at 55 MPH for 1⁄4 lap 0\n3 Mod. decel to 45 MPH −5\n3 Mod accel to 55 MPH 2\n3 Cruise at 55 MPH for 1⁄4 lap 0\n3 Mod. decel to 45 MPH −5\n3 Mod accel to 60 MPH 2\n3 Cruise at 60 MPH for 1⁄4 lap 0\n3 Mod. decel to 50 MPH −5\n3 Mod. accel to 60 MPH 2\n3 Cruise at 60 MPH for 1⁄4 lap 0\n3 Mod. decel to stop −4\n4 Idle 10 sec 0\n4 Hard accel to 80 MPH 3\n4 Coastdown to 70 MPH −1\n4 Cruise at 70 MPH for 1⁄2 Lap 0\n4 Mod. decel to 50 MPH −3\n4 Mod accel to 65 MPH 2\n4 Cruise at 65 MPH for 1⁄2 lap 0\n4 Mod. decel to 50 MPH −3\n5 Mod accel to 75 MPH 1\n5 Cruise at 75 MPH for 1⁄2 lap 0\n5 Mod. decel to 50 MPH −3\n5 Lt. accel to 70 MPH 1\n5 Cruise at 70 MPH for 1⁄2 lap 0\n5 Mod. decel 50 MPH −3\n6 Mod accel to 70 MPH 2\n6 Coastdown to 60 MPH −1\n6 Cruise at 60 MPH for 1⁄2 lap 0\n6 Mod. decel to 50 MPH −4\n6 Mod. accel to 65 MPH 1\n6 Cruise at 65 MPH for 1⁄2 lap 0\n6 Mod. decel to stop −4\n7 Idle 45 sec 0\n7 Hard accel to 55 MPH 4\n7 Cruise at 55 MPH for 1⁄4 lap 0\n7 Mod. decel to 40 MPH −5\n7 Mod. accel to 55 MPH 2\n7 Cruise at 55 MPH for 1⁄4 lap 0\n7 Mod. decel to 40 MPH −5\n7 Mod. accel to 50 MPH 2\n7 Cruise at 50 MPH for 1⁄4 lap 0\n7 Mod. decel to 40 MPH −5\n7 Mod. accel to 50 MPH 2\n7 Cruise at 50 MPH for 1⁄4 lap 0\n7 Mod. decel to stop −5\nThe standard road cycle is represented graphically in the following figure:","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 86—CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"59710c043edca45ffdaacff8b70992fd4f1132a73c9191b44530657d0b73da5b","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-appendix-iv-to-part-86","next":"us/40-cfr-appendix-vi-to-part-86"},"notice":"GroundRules: Original legal text. Not legal advice."}