>the first thing the police ask is "did you get a good look at the driver" followed closely by "did you see the make/model/plates" and "what state was it registered in?"
If your argument for this law is that it forces people to incriminate themselves, that's really an argument that the whole thing should be thrown out.
Under no circumstances should you be able to be compelled to assist in your own prosecution, either directly or indirectly.
What a weird interpretation of that.
That law has nothing to do with incriminating yourself (it's more about safety), but even if the law was specifically "so someone can see into your window and identify you if you do something bad", that's still not self-incrimination. Self-incrimination is requiring someone to testify against themselves.
Your position boils down to: "I should be able to commit traffic violations anonymously because anything else is an infringement on my 5th amendment rights".
Basically you're saying that any law is invalid if it makes or ensures that any kind of wrongdoing visible to witnesses. That's absurd.