Why would this sign be fitted to the front and rear of a bus?

Explanation: If you're carrying children on your vehicle and it isn't on a scheduled route used by the general public, the bus must display this sign to the front and rear. When carrying children to and from school, it's likely that you'll have to make several stops in places other than recognised bus stops. Think carefully before you stop. Don't cause unnecessary inconvenience to other road users.

Category: Carrying Passengers

References: The Official DVSA Guide to Driving Buses and Coaches: Section 1