After this bad driver rudely cut you off in traffic, YOU’LL NEVER BELIEVE what happened next with a laser that caused them to repent their wicked ways.

The issue:

Sometimes, drivers are terrible (Figure 1).

But there unfortunately does not exist any practical and useful way to accomplish the following:

Let these drivers know that they have committed a traffic infraction
Warn other drivers to watch out for these terrible drivers.

bad-driver — ***Fig. 1:*** *The blue car in this example is randomly weaving in and out of traffic, and is generally being a terrible driver.*

Proposal:

This plan has two parts, shown in Figure 2:

1) Every car must be painted with a special photo-reactive paint, which will (temporarily) change color when exposed to a specific frequency of light.

2) Every car ALSO must have a laser gun mounted on it somewhere (for example, on the roof or on the hood).

Then, whenever you see a bad driver, you simply point the laser at their car, and it fires a beam that changes the target car’s paint color (Figure 3), letting other drivers know that that car displeased you in some way.

bad-driver-lasers-1 — ***Fig. 2:*** *When a bad driver annoys you, you can just pull out your car laser and “paint” their car with bad-driving photon energy.*

bad-driver-lasers-2 — ***Fig. 3:*** After being hit by the bad-driving lasers, the blue car’s paint is now a bright orange, lettering future drivers know to steer clear of this car, and letting the driver (or perhaps their parents, for student drivers) know that they committed some sort of traffic infraction.

Conclusion:

This would remove the need for the DMV, traffic enforcement, and traffic signs, thus saving countless dollars every year.

PROS: Saves a ton of money, works well for everyone.

CONS: The laser might cause blindness, which could be remedied by modifying every car to have special window glass that absorbed that laser’s frequency. Additionally, pedestrians could wear sunglasses, so really there is no downside.