here is the info from the RMV website!
All this info is printed right on the front of your registration!
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Operating Requirements
Moped operators are subject to the traffic laws, rules and regulations of the Commonwealth.
Mopeds will have the right to use all public ways in the Commonwealth, except limited access or express state highways where signs prohibiting bicycles have been posted.
Mopeds may use bicycle lanes next to various ways but are excluded from off street recreational paths.
Moped operators must signal their intention to stop or turn by using either hand.
Mopeds may keep right when passing a motor vehicle which is in the travel lane of a way.
Restrictions When Operating a Moped
Mopeds will not be operated:
By any person under 16 years of age.
By any person who does not have a valid license or permit.
At a speed greater than 25 miles per hour.
Without the operator and any passenger wearing a DOT standard helmet.