This is absolutely brilliant (pun intended)!
LightLane's Lasers Make an Instant Bike Lane
A seat mounted laser projects lines on the road with a bike symbol behind the biker to make it very easy to see how much space a car should be giving to the biker.
This is really and truly superb!
It isn't perfect as the mount will project the bike lane anywhere the biker goes and there's nothing to stop the biker from not following the side of the road. But still, it is hard to argue with the visibility and clear marking of a safety zone this new system creates.