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Colorado has adopted Part 392 of the Federal Regulations.
Part 392 applies to a self-propelled or towed vehicle bearing an apportioned plate or having a manufacturer’s gross vehicle weight rating or gross combination rating of at least 16,001 pounds. Part 392 also applies to a vehicle used on a public highway to transport a placardable amount of hazardous materials.
A commercial diesel vehicle with a gross vehicle weight rating of greater than 14,000 pounds that is designed to operate on highways may not idle for more than 5 minutes within any 60-minute period.
Exceptions — A vehicle may idle for up to 20 minutes in any 60-minute period when the outside temperature is less than 10°F.
A passenger bus is exempt from the prohibition when idling for up to five minutes to maintain passenger comfort when non-driving passengers are on board.
A vehicle may idle to heat or cool a sleeper berth during a sleep or rest period at a safety rest area, fleet trucking terminal, commercial truck stop, state-designated location designed to be a driver’s rest area, or a location where the vehicle is legally permitted to park that is at least 1,000 feet from residential housing, a school, daycare facility, hospital, senior citizen center, or medical outpatient facility providing primary, specialty, or respiratory care.
There are also exceptions for:
The speed limit is 75 mph on specific sections of rural interstate, 65 mph on surfaced 4-lane interstates, 55 mph other highways, 40 mph open mountain highways.