This SAE information Report describes various dynamometer driving schedules currently in use in the world for measurement of exhaust emissions and fuel economy of passenger cars and light trucks Issuance of this information report will allow driving schedules to be deleted from individual test procedures@ thus reducing the amount of repeated information in the SAE Handbook. This information report includes: 1 ?C Descriptions of driving schedules. 2 ?C Second-by send definition of speed versus time sequence.