Thank you for all your help. I nested a few small loops and it worked like a charm....except for like you said when a very fast car goes by when the other lane is potting it can miss it. It happens rarley but it happens. I am set up with the light sensors secured in the track and I built a light source above them so I am going to work on keeping them somehow. (reed switches would work but I also know that other people have made the light sensors work) I will start researching light sensing circuits tomorrow. But in the mean time Thank again for the advice.
Snap