I'm going to assume the layby is enough room to let cars pass. Whichever car is facing the car in the layby head on comes side by side so the car in the layby may leave after the owner has finished. The other car can then use the layby to pass safely and the car next to the layby is free to move.<br/><br/>logical but I'm also thinking possibly wrong *gets a packet of bacon out* I'll cook this then shall I?