Some jurisdictions allow for empty trucks to bypass.
Some scale sites also incorporate in motion (IM) weighing typically in the right lane prior to the pull out for the weigh scales. The IM scale is not as accurate as a static scale but is used for screening. In this case, a light will indicate that the truck can by-pass or must report to the scale for weighing or inspection.
There is also an allowance sometimes made to allow trucks to bypass if the scale lane is full as you approach. Or, you can simply take your chance and see if you get chased down.
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