actually the secretary of state at the federal level, section 49 of the national highway safety administration doesn't even list "moped" at all.
The proper term for what we ride, at a federal level is motor driven cycle.
"motor driven cycle"
look for moped, search it yourself.
http://www.access.gpo.gov/cgi-bin/cfrassemble.cgi?title=200249
you wont' find it.
motor driven cycle
and retardboy has a ripoff chingchong scooter