As the name suggests, this type of weighbridge simply sits on top of the road surface. This minimises the amount of foundation work required. This design is often selected when the bridge may need to be moved, or in temporary installations. Because the weighbridge sits above the road surface on/off ramps are added to each end of the scale. This enables easy access.
Before purchasing, check the overall height of the weighbridge. Higher decks need longer ramps. This increases the overall footprint of the weighbridge as well as the turning circle for vehicles approaching the bridge. For safety, extreme-duty guide rails are bolted in place. This provides a strong and effective way of keeping vehicles centrally positioned on the bridge.