I've played much and found some issiues:
1. Whole path is set when car starts. If we change roads during it's journey it will stop and mostly will stuck. Sometimes it regenerates path but mostly stay at position. If we add some roads near - it may try change path. I need to create 2 separate paths (new and old) and wait if all will drive by new path, than can delete old one.
It should regenerate path if cannot move because there is no road (from calculated path).