Worldwide Harmonised Light-Duty Vehicles Test Procedure

What is WLTP?

WLTP stands for the Worldwide Harmonised Light Vehicles Test Procedure. It is a replacement for the New European Driving Cycle (NEDC) test. The test covers emissions and consumption values for vehicles.

 

Reflecting real world consumption and emissions values

All vehicles in the EU are subject to emissions testing prior to being released for sale in the market. Currently, this is done through a lab test called the New European Driving Cycle (NEDC), however, this is being replaced by the Worldwide Harmonised Light-Duty Vehicles Test Procedure (WLTP).

WLTP will also be supplemented by the Real Driving Emissions (RDE) test that measures pollutants directly on the road. The new test will ensure that lab measurements better reflect the on-road performance of the vehicle.

There will be a phased transition between WLTP and NEDC between September 2017 and 2020. During this time vehicles will have a derived NEDC CO2 value and consumption value, as well as the WLTP CO2 and consumption values in relation to type approval. WLTP testing legislation came into effect on 01 September. Further details can be found in the timeline section.


Testing procedure changes

Like NEDC (New European Driving Cycle), WLTP is a laboratory based testing procedure. There are some key differences with WLTP to provide consumption and emissions values that better reflect real world performance. The advantage of laboratory tests is that they are carried out in controlled conditions. This enables customers to gain a true comparative view between vehicle models.

Conditions: NEDC  WLTP 
Test duration  20 min.  30 min. 

Test distance

11 km  23.5 km 
Time spent stationary  25%  13% 
Test phases  Urban/Extra-urban, (combined)  Low, Medium, High, Extra high, (Combined); (plus “City” for electric vehicles and vehicles with plug-in hybrid drivetrain
Speed 

Average: 34 km/h

Maximum: 120 km/h 

Average: 46.6 km/h

Maximum: 131 km/h 

Temperature 

20-30° C

Cold engine start 

14° C

(tested at 23° C corrected for 14° C)

Cold engine start 

Special equipment options  Not taken into consideration  All equipment options are considered in terms of their influence on aerodynamics, weight and rolling resistance.