I realise this is an old page, but I too want to make some Dragster style lights for the Dog Club. Any circuits out there I can "borrow"?! The lights need to have two lanes going Red - Yellow - Yellow - Yellow - Green changing at about half second intervals. I'd also like to make a timer that starts by photoelectric cell when the dog passes the "gate" and stops when he comes back through the gate. Take a look at "Flyball" on U-Tube and you'll see what I mean!