It seems that the van's location is currently tracked based on the road square it is facing - i.e. in this picture, the van registers as being on the same square as the cow when it is on the line to the left of the cow.

This task is to investigate alternative ways of positioning/tracking the van, i.e. basing its location on the road square it is facing away from/has just driven over or having the van stop in the centers of road squares rather than on the lines separating them.