I don't understand how the Rolling Resistance works

More precisely, what I don’t understand is why the car isn’t moving backwards in our implementation when it’s at a standstill. The RollingResistance is linear and only dependent on the Normal force, which is always present. So I’d expect to start moving backwards very slowly when velocity is 0;

Ok, while I was writing this, I went and tested with a really high coefficient. It does actually start moving opposite of last input direction. I decided to post this, in case other people have the same question.