Recently, I've gone neon. I felt like I was taken by surprise by a few cars on my autumn runs. Maybe it was a combination of the iPod or the changing trees? (I guess with all the foliage etc. its harder to see runners?) Anyway, I started running in this Nathan hi-visibility running vest, and I have to say . . . I feel much safer. I might look like a dork in neon, but I'd rather be safe. I've also got some high tech shirts that I run in which are day-glo orange, but obviously you can't run in the same shirt all the time, so this fits over my additional clothes as the weather gets colder. I also bought a hi-vis fleece hat from Carhartt which I cannot wait to bust out when the weather gets colder! What do you wear to ensure visibility?