If you feel that more visibility would help, consider a H.I.D. light system for daytime use. The NiteRider Storm, combined with their powerful rear flasher, will definitely stack the odds in your favor, day or night. I highly recommend the NR taillight, but if you don't need one, the Light & Motion H.I.D. lights are getting good remarks too.

I was in a similar accident except that the car hit me from the side, instead of me hitting the car from the side, and I'm pretty sure that could've been prevented with a daytime-visible headlight. Last year, another motorist hit me as I was descending at 30mph, and again, it was a case of simply not being noticed. The "Whoa! What the heck is THAT " factor of the H.I.D. models, combined with their very high output for ~4 hours, puts them at the top of my wish list.