Division 4.1.3.1 Vehicles of categories M1, N1 and M2 ≤ 3 500 kg

The calculated values for the acceleration test and the constant speed test are given by:

• L_{wot rep} = L_{wot (i+1)} + k * (L_wot(i) – L_{wot (i+1)})

• L_{crs rep} = L_crs(i+1) + k * (L_{crs (i)} – L_{crs (i+1)})

Where k = (a_{wot ref – awot (i+1)})/(a_{wot (i)} – a_{wot (i+1)})

In the case of a single gear ratio test, the values are the test result of each test.

The final result is calculated by combining L_{wot rep} and L_{crs rep}. The equation is:

L_urban = L_{wot rep} – k_P * (L_{wot rep} – L_{crs rep})

The weighting factor k_P, gives the partial power factor for urban driving. In cases other than a single gear test k_P is calculated by:

k_P = 1 – (a_urban/a_{wot ref})

If only one gear was specified for the test k_P is given by:

k_P = 1 – (a_urban/a_{wot test})

In cases where a_{wot test} is less than a_urban:

k_P = 0