Section 19(4)(b) in The Motor Vehicles (Driving) Regulations, 2017
(b)the driver of a bus, including a school bus, a goods vehicle, a tractor trolley carrying farm labour or goods and a vehicle carrying hazardous, flammable or dangerous materials, shall stop at the approach of the railway crossing and the driver of the vehicle shall cause the attendant or any other person in the vehicle to walk up to the level crossing to ensure that no rolling stock is approaching from either side, and the attendant or such other person shall guide the driver across such level crossing: