Whatever laws are on the books are virtually never actually enforced against motorists, because motorism (and disdain/resentment against cyclists) is deeply embedded in the culture.

The default reaction of the median American (or at least, the median law enforcer) to any accident involving a motorist and a cyclist, regardless of actual fault, is “fucking bikers always breaking laws, running red lights and stop signs, if they want to take our lanes and slow us down, why don’t they think they have to follow rules like a REAL vehicle,” etc.