Saw a couple cyclists (that might be too strong of a label...people who happened to be moving via bike) while driving last night only b/c they had reflectors. Granted, they were moving perpendicular to me, but they ran a stop sign, were dressed in all black, and were riding all over the road. Could've been a mess.

I left 'em on my commuter. Can't hurt! Someone else took them off of the rest of my bikes before I bought them.