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In addition to WLTP, the RDE test procedure must also be used in Europe. RDE stands for Real Driving Emissions. Unlike the NEDC and WLTP, the emission measurements are performed in real traffic conditions rather than on a test rig. The exhaust emissions recorded while driving in traffic are called real emissions.

RDE driving cycle

To measure the RDE, the vehicle is driven on a mix of roads with random acceleration and deceleration for approximately 90 to 120 minutes. The vehicle is fitted with a Portable Emissions Measurement System (PEMS). This device measures exhaust emissions (nitrogen oxides and carbon monoxide) along with the associated engine, vehicle and environmental parameters on a predefined route. By linking this information to GPS data, a precise relationship can be established between the driving situation and the resulting exhaust emissions.

See also