Oh how I love to capture light trails!
I know it's probably a bit of a cliche, but capturing light trails from passing cars is just plain fun. You are always trying to time it just right, and sometimes you miss, so you keep trying. But when you get that one perfect shot when the light trails curve out of the frame in the distance, well then it's all worthwhile! I only had one chance for this one, as the street was really empty, so I was quite happy when I saw it on the back of my camera a moment later!