Was a good day, only suggestion is on the miniwang, cones going from the finnishing box to the edge of the track that the timer/cone mover is on, as a few times cars went straight past when they shouldn't of, could leave the other side open for when other people need to move around the circuit still. Would also help flow as you would have peice of mind that people would know where they were going so you could release the next car as soon as the previous car is clear even if you are still walking off the track. Might save 1-4seconds per release? would add up.
Oh, and I recommend sunscreen.