A weigh station is a checkpoint along a highway to inspect vehicular weights and safety compliance criteria. Usually, trucks and commercial vehicles are subject to the inspection.
Weigh station along Interstate 74/Interstate 77 in North Carolina
Road signs, like this one on Interstate 70 in Colorado, typically indicate that a weigh station is upcoming, and a signal indicates whether it is open.
A truck scale (US), weighbridge (non-US) or railroad scale is a large set of scales, usually mounted permanently on a concrete foundation, that is used to weigh entire rail or road vehicles and their contents. By weighing the vehicle both empty and when loaded, the load carried by the vehicle can be calculated.
A weighbridge (foreground) in Tanzania
A weigh bridge in a hump classification type of yard
Electronic indicator for the bridge shown above. This allows input of the vehicle empty weight and can compute and display the amount of material.
A full-size weighbridge