Don't you just hate it when you're driving down the road in real life and some other real life idiot coming the other way decides to pass the real van in front of him so he moves into your lane traveling the opposite direction and this all happens at a series of speed bump in the middle of a highway for some bizzare reason relating to real life problems so while you don't crash CLEARLY neither of you can actually drive in the empty lane around the other so instead you both honk and flash your headlights at each other while impossibly rotating your real cars in place out of actual genuine frustration?
BOY DO I HATE THAT SITUATION THAT ACTUALLY CAN HAPPEN IN REAL HONEST TO GOODNESS LIFE!
If only the real department of transportation could afford to buy more yellow paint for two lane two way roadways.
Okay, enough sarcasm. While a interesting idea for a game it essentially boils down to a lot of repetitive trial and error which isn't really entertaining considering the puzzle solutions are difficult to predict.
Some of those deadlocks are just plain ridiculous. I could understand cars getting stuck if there were a wreck in front of them... But if two cars are alone in the same lane in a two lane road intending to go in separate directions, one of them will drive around the other and they'll get to where they need to go.
In short: Cool Idea, needs some reworking, specifically needs better car AI.