driving my cage, I can tell you that at night, reflective stuff and lights help! Bikers are *invisible* otherwise! And those obnoxious fluorescent yellow jackets are lifesavers, closely followed by at least wearing yellow like you're leading in the Tour. And don't cover that beautiful yellow up with some drab colored messenger bag etc., get a yellow one! And keep the batts fresh in your head/taillights, I rolled down the window and told one biker he needed new batts in his taillight, he was dressed in dark stuff and his taillight would have made him very visible, if it weren't very dim. Those poor red LEDs were barely forward biased. (On the other hand, lotsa voltage can make your red LEDs yellow, for a short while!)