This sign is used to compel drivers of certain heavy vehicles to use the road or part of the road indicated by this road traffic sign. The R102 road sign can be placed on any public road.Strong Heavy Vehicles This road traffic sign, known as the Vehicles Exceeding Mass Only Safety Sign, is intended to force drivers of specific heavy vehicles to use the road or a portion of it. Vehicles should not utilise a certain route or lane if their Gross Vehicle Mass (GVM) or Gross Combination Mass (GCM) is less than the mass listed on the sign. The goal of this road traffic sign is to compel operators of certain heavy vehicles to utilise the road or a portion of it. Use the portion of the road not designated by this sign if your vehicle's GVM or GCM is less than the mass stated in tonnes.