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 &#8220;sawtooth&#8221; 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 are characteristic parameters 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