I'd just add one more comment about visibility: IMO, none is better than a little. I think a lot of cyclists are unaware of target fixation because (1) we ride with our backs to traffic and (2) most of us haven't taken a traffic skills course in a long time. Running (and personal experience with target fixation on the moto ) has taught me that probably nine times out of ten, when a motorist buzzes me on the bike - and when a pedestrian or cyclist actually gets creamed by a car - it's because of target fixation. What I've learned running is that drivers need between one and two tenths of a mile to recover from target fixation. IOW, if your visibility aids mean that someone first sees you at 1/10 mile instead of at 100 feet, you're more likely to get hit, because when they first see you they'll steer toward you, and they won't have had time to recover and veer away.

What I mean is, there's no such thing as overkill when it comes to visibility, but "underkill" is a serious problem.