You’re leaving your vehicle parked on a road and unattended. When may you leave the engine running?
If you'll be parking for less than five minutes
If the battery keeps going flat
When parked in a 20 mph zone
Never if you're away from the vehicle
When you leave your vehicle parked on a road, switch off the engine and secure the vehicle. Make sure no valuables are visible, shut all the windows, lock the vehicle, and set the alarm the vehicle has one.
You may also be interested in these theory test questions