Each state has different laws in that regard, but most are pretty standard.
However, since bencadenbach is in Nebraska and the Cornhuskers are red, the local law might let him slide. In fact, if I was ever stopped there with the red LEDs, I'd say it's to support the Huskers!
Would that fly?
The signal colors are Federal DOT. Amber for the front
However, a few states do not require signals at all