There's got to be a loophole there.
In PA, which is totally different, a driver's license gets you on a moped.
I think that's what Andy meant - as a licensed driver, he can ride a moped. As a licensed motorcycle rider, he can ride two mopeds at once, or something.
So coreyc, doesn't that mean that you can only ride a moped with the same restrictions you'd have on a car - you know, like a Cinderella license? Something like, you can only ride during the day, or with a licensed driver sitting shotgun (um...), or back and forth from school or work.
I never figured out how they'd know that last one. Anyway, check the MD DMV website for laws - there's probably at least one that convinces your parents if not the local law enforcement.