I don't ride but I have a ton of friends that do and their safety is always a concern of mine. With the bikes being outnumbered and and outweighed by cars today it's important to be aware as drivers. I've had these stickers on my car for a year, the bikers might not know what they mean yet but just explaining them and the importance of awareness to people is enough for me.
Bikerfriendly Link
Bikerfriendly Link