I'm with AdamDZ. I'm alive because of the strobe function on my Cateye 610. I even had an incident where a car pulled almost into me from an off ramp without seeing my 610. That is the driving dead! I also have a not-as-bright dynamo light with LED, headlight, and stand light. I have Trek rear flashie by Spanninga and an LD1000 from Cateye on flash day or night. The LD1000 has side LEDs as does the Trek. When I figure out the mount, I have a police take-off LED amber strobe for the rear. The whole system gives me redundancy for the times the batteries die on one of the lights. And it does happen.