Rule 123 : The Driver's Guide to Stationary Vehicles and Idling
Based on the UK Highway Code and Regulations 98 & 107 of the CUR . Focuses on noise and emission prevention .
Strict Prohibitions ( The " Must Nots " )
The 2 - Minute Rule
Legal Exceptions ( Permissible Idling )
Never Leave a Running Vehicle Unattended
It is a legal violation to leave a parked vehicle unattended while the engine is still running .
Evaluate the Duration of the Stop
If the vehicle is stationary and likely to remain so for more than two minutes , proactive steps should be taken .
Stationary in Active Traffic
It is legally permissible to keep the engine running when the vehicle is stopped due to the flow of traffic .
POWER OFF
No Unnecessary Idling on Public Roads
Drivers must not leave a vehicle engine running unnecessarily while the vehicle is stationary on any public road .
Secure the Vehicle and Cut the Power: Apply the parking brake and switch off the engine to minimize environmental impact .
Diagnosing Mechanical Faults
Engines may remain running if the stationary period is required to identify or diagnose a vehicle fault .
Legal Authority
Reduce Emissions and Noise Pollution
Turning off the engine during extended stops is the primary method for reducing a vehicle's local pollution footprint .
These specific regulations provide the legal framework and enforcement power behind the idling and stationary vehicle rules .
