Using private companies to enforce “red-light” laws often gives those companies an incentive to raise money, rather than improve safety.

That’s the conclusion of a new study by the U.S. Public Interest Research Group.

The study found the regular use of disincentives for things like lengthening the yellow light lights, which it says would improve safety but reduce revenue.

However, the report doesn’t take a position on whether red light cameras overall are a good idea — just on whether it’s right to hand over enforcement to private companies.

Most studies show that red light cameras reduce the most deadly collisions, but those studies have been criticized for being pro-red light camera.

As for motorists, almost everyone hates ‘em.