Cars are stopping like they hit an invisible obstacle and only move out in one direction, even if there..

When cars leave the lot they sometimes stop at the end even when there is nothing to stop for. If you send another car behind it and the stopped car moves off then your second car will hit where the car was stopped. You have to be sure that the preceding car has actually exited before sending any other cars after it.

Update the game then the walls become visible

They want you watch more commercials - next step after they invented a “money car”. Greedy rodents