<P> In each class, there are several driving tests designed to represent real world vehicle operation on urban and extra-urban roads, motorways, and freeways . The duration of each part is fixed between classes, however the acceleration and speed curves are shaped differently . The sequence of tests is further restricted by maximum vehicle speed V . </P> <P> Increased variety of manual gearboxes with 4, 5, 6 and 7 gears makes it impossible to specify fixed gear shift points . The WLTP testing procedure instead provides an algorithm for calculating optimal shift points, which takes into account total vehicle weight and full load power curves within normalized engine speeds, covering the wide range of rotation speeds and engine power allowed by current technology . To reflect practical use and fuel efficient driving style, frequent gear changes occurring in less than 5 seconds are filtered out . </P> <P> Although an improvement over the NEDC, the WLTC cycles are still unrealistically slow . For example, the most rapid 0--50 kilometres per hour (0--30 mph) time is 15 seconds . Most drivers in Western Europe accelerate from rest to 50 kilometres per hour (30 mph) in 5 to 10 seconds . There is also no hill climbing in the cycle, and modest gradients increase engine loads by 2 to 3 times, with a subsequent increase in pollutants . </P> <P> The WLTC driving cycle for a Class 3 vehicle is divided in four parts for Low, Medium, High, and Extra High speed; if V <135 km / h, the Extra High speed part is replaced with Low speed part . </P>

Worldwide harmonized light vehicle test procedure (wltp)