A ‘bus’ is defined as a motor vehicle which has more than 12 seats (including the driver).
If the vehicle has 12 or fewer seats (including the driver’s seat), then any children under 7 years of age must use an appropriate child car restraint or booster seat.
If a bus has more than 12 seats (including the driver’s seat), children are not required to use child car restraints or booster seats.
However, it is recommended that children are placed in a child car restraint that is appropriate for their age and size wherever possible.