Are there exceptions to allow idling for more than 3 minutes?
Yes. Diesel vehicles whose primary power source (engine) is necessary for operation of mechanical devices such as refrigerated trailers commonly called reefers, hydraulic lift gate pumps, air leveling equipment, cherry-pickers, etc. Some turbo-diesel engines, especially newer models, require approximately 3 to 5 minutes of idling to cool down the engine and avoid damage. These vehicles will be allowed to idle for a length of time necessary for cooling as determined by the engine manufacturer and set with automatic timers.
