I bought two of something similar to this. The lanes are narrow.

It has 5 lights that will stay solid flash or chase plus the two laser lanes. They were on ebay for under 10 with free shipping. I bought them mainly for the novelty and the rear flashing lights. They have been fun on group rides as a conversation piece and they also put a stripe on your calf as you ride. I doubt any car could see the laser lanes unles it was super dark or they were close enough that it wouldn't matter anyway. I like them though.