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Delaware has adopted Part 392 of the Federal Regulations.
Part 392 applies to a single vehicle or a vehicle in combination operated in intrastate commerce with a gross vehicle weight rating or gross vehicle weight over 26,000 pounds, and any size vehicle hauling hazardous materials requiring placards.
A self-propelled vehicle designed to transport property or passengers with a gross vehicle weight rating of greater than 8,500 pounds may not idle for more than three consecutive minutes when the vehicle is not in motion.
Exceptions — A vehicle may idle for up to 15 consecutive minutes to provide heat to the occupant when the temperature is between -10°F and 32°F. There is no limit when the temperature is below -10°F and no nuisance is created.
A transit or school bus may idle for up to five minutes prior to passenger boarding.
There are also exceptions for:
The speed limit is 65 mph on specified highways, 55 mph (or as posted) on other highways.