I did not say they were legal, did I, NO is the answer to save you searching.
The are plenty of things illegal, that are accepted as everyday occurences, aspects of driving and cars are no different.
It is LEGAL for a MALE to urinate on the on the rear wheel of his car in public, so long as his right hand is on the car, it is illegal to break a boiled egg at the sharp end, it is LEGAL for a lady to be topless in public, but ONLY in a FISH STORE.
So I don't think many people will worry about legalities, so long as safe do you ?
tabetha