It is usual to draw the sum of the driving resistance force and the drive force on whell over the vehicle speed. Such a traction diagram of a vehicle in standard design is shown below.

Here can be seen, that the rolling resistance force has a very small amount at higher speeds. At higher driving speed (above 120 km/h), the last three points can be neglect. This leads to the equation (1.1)

(1.1)

The air drag force is given by the equation:

(1.2)

(1.1)

The unknown values in equation (1.1) are the cross sectional area and the air restance performance.