Originally Posted by
noglider
Actually, when I'm not sure if an oncoming driver sees me, I wiggle my handlebar in order to wiggle my headlight. I'm pretty sure it works, as I've gotten some drivers to dip their high-beams that way.
Anyway, in general, bikes are pretty invisible on the road, so the more you can do to make yourself visible, the better. Use as many devices and techniques as you can, rather than looking for the best one device or technique.
That's a good idea actually, I use a helmet light in addition to the bar light, so I just use the helmet light to shine/flash through their windows.