The U.S. FTP-72 (Federal Test Procedure) cycle is also called Urban Dynamometer Driving Schedule (UDDS) or LA-4 cycle [CFR 40, 86, App.I]. The same engine driving cycle is known in Sweden as A10 or CVS (Constant Volume Sampler) cycle and in Australia as the ADR 27 (Australian Design Rules) cycle. This cycle should not be confused with the UDDS schedule for heavy-duty vehicles.
The cycle simulates a urban route of 12.07 km (7.5 mi) with frequent stops. The maximum speed is 91.2 km/h (56.7 mi/h) and the average speed is 31.5 km/h (19.6 mi/h).
Figure 1. FTP-72 Cycle
The cycle consists of two phases: (1) 505s (5.78 km at 41.2 km average speed) and (2) 864s. The first phase begins with cold start. The two phases are separated by stopping the engine for 10 minutes. In the U.S. a weighting factors of 0.43 and 0.57 are applied to the first and second phase, respectively. In Sweden both phases have the same weighting factors. Emissions are expressed in g/mile or g/km.