Looking at the dancing cars issue with my 'software developer' hat on. It seems to be that the cars' direction vectors are probably calculated relative to the direction vector of your car. (so that you can then easily compare the vectors and see if/when they will converge).
Problem being, as the speeds approach zero, then the computer runs out of precision on the numbers (underflow), so that the slightest change makes a large change in it's calculated direction of travel. Of coarse, if the speeds are near zero, the direction doesn't matter that much.
So the cars 'dance'.
Just a guess, I don't have any insider information, but probably gives insight that the screen is actually giving a real information, and what the car is thinking.
I did (very) briefly consider Heisenberg uncertainty principle
, but that doesn't really apply at this scale.