This is something that bugs both myself and my DH. We have a dark green car and a black car. The amount of times people have gone to pull out in front of our green car - which is a van! - simply because they didn't see it is unbelievable and this is on a bright, sunny day! As soon as it hit a certain time in the afternoon - which is about 4:15-4:30pm now - our headlights come on. I really wish other drivers would realise how invisible they are at times.