MSA Blue book regulation J4.17 states: Any means of identifying
individual cars during a competition MUST be removed at the finish of the
Also MSA Blue book regulation Q11.1.1 states: Competition numbers must be
covered at all times when driving on the public highway.
I think that pretty much makes it clear that no racing car (but not rally
car) displays racing numbers when being driven on the road. However, while
a racing car no longer used for racing clearly could display a racing
number on the public highway none ever do because there would be no better way
to say 'this car is just pretending to be a racing car".
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