US: Heavy-duty: CBD

US: Heavy-duty: CBD


The Central Business District (CBD) Cycle is a chassis dynamometer testing procedure for heavy-duty vehicles (SAE J1376). The CBD cycle represents a “sawtooth” driving pattern, which includes 14 repetitions of a basic cycle composed of idle, acceleration, cruise, and deceleration modes.


Vehicle speed over the duration of the CBD cycle is shown below:


CBD Driving Cycle


The following parameters are characteristic of the cycle:

  • Duration: 560 s
  • Average speed: 20.23 km/h
  • Maximum speed: 32.18 km/h (20 mph)
  • Driving distance: 3.22 km
  • Average acceleration: 0.89 m/s2
  • Maximum acceleration: 1.79 m/s2

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