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Maine has adopted Part 392 of the Federal Regulations.
Part 392 applies to a vehicle with a gross vehicle weight rating, gross combination weight rating, gross vehicle weight, or gross combination weight of 10,001 pounds or more, or a vehicle transporting hazardous materials which require placarding
A commercial motor vehicle or a gasoline-powered motor vehicle may not idle for more than 5 minutes in a 60-minute period.
Exceptions — A passenger bus may idle for a maximum of 15 minutes in any 60-minute period to maintain passenger comfort while non-driver passengers are on board.
A vehicle may idle for 15 minutes to operate heating equipment when the ambient air temperature is 32°F or below. A vehicle may idle as needed to provide heat when the ambient temperature is below 0°F.
There are also exceptions for:
The speed limit is 75 mph on interstates and other divided controlled-access highways, 60 mph on other highways (or as posted).