My gues was correct, path was too narrow. U see, when sprite with pathfind behavior is wider than path or collides with another (relativly overlaps with another object) it blocks because pathfind behavior cannot find free cell to move on. That's why some of my cars wouldn't move :]
OffTopic: Here in south Poland we have +15 degrees of Celsius and I whole day I'm spending with construct 2. Heh... But still I like it
I don't know why cars even they have solid option set and collision enabled after reaching destination they parking on themselves...