I have started attaching a taillight to my handlebar pointed down and to the left to make a red dot on the road about 3 or 4 feet to my left, hoping that drivers would try to not drive over the dot.

After four nighttime commutes like this, not one car has driven over the dot. I am not sure if drivers actually stay farther away because of the light, or if I just thought they were closer than they were because I did not have a frame of reference. Four days is probably not long enough for a statistically valid sample, but I will keep tracking.

Has anybody else tried this, and what have your results been?