so it does make sense. So much that you wonder if it has ever been tested. Is it possible that much like signal lights on both front and back, it contributes to more available and usable info transmitted at light speed . Just like any other signal light. While you have 50 years, perhaps you never thought of this before and are just now starting to examine the idea. I think if you look very closely at certain assumptions you are making you will find there is at least a case to be investigated here
So, it hasn’t been tested. There’s too much light pollution on the roads as it is. I rest my case.