US: Heavy-duty: UDDS

US: Heavy-duty: UDDS


The EPA Urban Dynamometer Driving Schedule (UDDS) has been developed for chassis dynamometer testing of heavy-duty vehicles [CFR 40, 86, App.I].


This test is sometimes referred to as “cycle D”. The UDDS schedule was the basis for developing the FTP Transientengine dynamometer cycle. The HD-UDDS cycle should not be confused with the FTP72/LA4 cycle for light-duty vehicles, which is also called UDDS.



The following are basic parameters of the cycle:

  • Duration: 1060 seconds
  • Distance: 5.55 miles = 8.9 km
  • Average speed: 18.86 mi/h = 30.4 km/h
  • Maximum speed: 58 mi/h = 93.3 km/h

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