Idling refers to any time a car engine is running, but the car is not moving. An example is when a driver comes to a stop at a red light.
Engine idling heavily increases the amount of exhaust fumes emitted into the air and should be discouraged when waiting/parking, especially outside schools, for a number of reasons...
The gas emissions from idling cars affect the air quality around our schools. This is bad for young people as their lungs are still developing and they can be negatively affected by increased air pollution.
Pupils crossing the road may find it harder to hear cars that are actually moving. This is even worse when it is busy and pupils have to step out in the road between parked cars.