Thanks for the reply.
No car in pits = GREEN LED entry ON, GREEN LED exit ON
Car drives over switch/sensor and enters pit lane = GREEN LED entry OFF, RED LED entry ON and flash, BLUE LED ON and flash, GREEN exit OFF
Car drives over switch sensor at end of pit = RED LED entry ON and continues flashing 10 Seconds, BLUE LED OFF, RED EXIT LED ON and flash 10 seconds
Car now totally clear of pit, after 10 second flashing system reset.
Hope that makes it a little clearer, il have a look at the link and see if i can make sense of it lol.
what type of switch/sensor would i use? I wanted to fix a switch under the slot the car guide blade sits in so it pushes the switch closed when it passes over it.