Once I get my bike all rigged up with reflectors and such I like to put a video camera on my car and turn the headlights on, then I video tape myself riding away from the car for a few hundred feet and then back. I do this once without lights on and once with lights on. From this I get a pretty good idea of how I look, when I turn around I even get to see how visible I am from the side. One thing I have found to be very effective on my wheels lately is not so much a small tab of tape every 3 spokes or so but 5 tabs together in 3 places on the rim, this gives a much more eye catching design as it reflects 3 larger areas of light as opposed to a bunch of tiny ones.