[Still Thinking]

OK, says “covering or substance” on a plate, so the pickup gate should still be OK.

[Neidermeyer]

OK, says “covering or substance” on a plate, so the pickup gate should still be OK.
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As are license plate mounts for motorcycles that put the plate to the left side of the rear tire, usually on the swingarm and safe from red light cameras high and to the right side.

[Chauncey Gardiner]

Are frames prohibited?