I've been considering building something like this for a while. We live by a busy highway and a TON of cars pass on a daily basis. I'm really just interested in counting the number of them though I love data so anything that I could get I'd love to get. That said, I did the typical "hit a wall" thing and just performed it all in my head until I realized that I'd have trouble when this or that happened and stalled. Guess I probably should've just started. This still has some bugs to work out for my situation but seems like an awesome start!