The Maine Turnpike Authority requires all overlimit loads to obtain an MTA overlimit permit for travel on the Maine Turnpike.
These permits are available at the staffed over-limit lanes of any MTA Toll Plaza and are $10 which must be paid in cash, in addition to any applicable toll.
The vehicle must also have a separate overlimit permit from the Bureau of Motor Vehicles for travel on all non-Turnpike highways. Information about BMV overlimit permits can be found
here.
Specific MTA rules governing overlimit vehicles can be found
here.