Lane occupancy is the ratio of the sum of the lengths of the vehicles to the length of the road section in which those vehicles are present.
To find lane occupancy, we are concerned with the standard dimensions of the vehicles.
For example 4 vehicles of lengths 18′,20′,22′,24′ are present over a length of the road of 500′.
Lane occupancy = (18+20+22+24)/500 = 0.168
More is the lane occupancy, more will be the traffic density.