[Al Skierkiewicz]

A test for me would be the answer to this question. "How long does your appendage cover the numbers on your bumper?" If the answer is 'most of the match', 'the entire match' or 'as soon as auto starts' I would think you have crossed into the "obscured" definition. If the answer is 'only when we are picking up a ball' then I would think that prudence suggests that you are not obscuring the number.