<P> Alberta scales are all of the' weigh - in - motion' type, and vehicles are not required to stop; they merely have to slow to 10 km / h . </P> <P> Scales which are not operational are often available to drivers as a' self - weigh' site, where drivers can check their axle loads without enforcement officials being involved . </P> <P> The government of the North West Territories operates only one scale . It is situated in the townsite of Enterprise, 83 kilometres north of the border with Alberta, and issues permits for vehicles from other jurisdictions as well as weighing vehicles and enforcing hours of service legislation . </P> <P> In Taiwan, weigh stations (Chinese: 地磅 站) are located on major highways, especially at all toll booths on freeways . Advanced signs tell that trucks must enter the weigh stations when the attached lights are flashing, usually when tolls are collected . </P>

When do trucks have to stop at weigh stations