Laser light to show cars what is 3 feet

Hello, in this age of technology ... is there some kind of laser light that could point to the left of your bike, at a right angle of your driving direction, to show drivers how far they need to be when overpassing you? I am thinking of a kind of light saber, as in the movie Star Wars. (It doesn't need to be so deadly) Or like the pointers sometimes used in PowerPoint presentations, but they would need to be limited to 3 feet and perhaps a bit wider or thicker.

I'm not keen of the plastic bits that stick out because they could get caught by something, even if mounted on hinges.

I like your glow in the night tubes. They go in the right direction of creating light not just on the bike but also around (judging by the photos). Are they waterproof enough?