If it is road legal and you have a full driving licence and insurance you can ride it on a motorway.
depending on state laws
depending on state laws
That depends on what country you're trying to ride in.
yes you can as long as you are not blocking anyone.
can you ride a 125 cc moped on spain's motorways
no you are not allowed on the beach with a quad or motorcycle even if they are insured, but google for off road tracks near you where you can pay to ride your vehicle
i believe the 700cc quad is the biggest you can ride on the road. not quite sure.
50cc - 600cc
No
16
Of course you can! In fact most people wouldn't even see a bike on a motorway in the first place!