I must admit I like seeing the think bike stickers in cars, I always acknowledge the driver, by raising my hand when I'm on my bike as I presume that they are either a biker, a relative of a biker or a bike friendly driver.
I also have a think bike sticker in my car, and like it on the odd occasion when a fellow biker acknowledges me.
Do you acknowledge drivers with think bike stickers, or have I gone mad and lost the plot.
Steve