Davis County, UT Environmental Rules: Vehicle Idling Restrictions (2026)

12, bars any owner or operator from allowing a motor vehicle's engine to idle for longer than two minutes unless an exemption applies. 050 to enforce it across both incorporated and unincorporated Davis County under Utah Code Section 26A-1-114(1)(a), recognizes five exemptions: traffic a driver cannot control, such as being stopped in a line of traffic, at a railroad crossing or in a construction zone; supplying power to a refrigeration unit cooling a truck or trailer's cargo area; providing heat or air conditioning to a sleeper unit or an occupied bus; supplying power to an emergency response vehicle; and idling necessary to protect the health and safety of a driver or passengers.

The same chapter separately bars a vehicle from producing visible emissions beyond the exceptions listed in Utah Code Section 41-6a-1626. 12, which is built around the biennial emissions inspection and Certificate of Compliance required before registering a vehicle through the Utah Division of Motor Vehicles, the idling limit is a standalone conduct rule that applies to any vehicle, inspected or not, operated in the county. The Department may issue a notice of violation, negotiate a monetary penalty, or, for a vehicle otherwise subject to the inspection program, request that the Utah Division of Motor Vehicles revoke its registration.