How Did They Levy Tolls on the Erie Canal?

As you drive across America’s Interstate Highway System you may notice certain special off-ramps that only large cargo trailers take. These weigh-stations are used by the states to check permits, as well as determine whether a truck is within weight limits based on how heavy it is. The truck simply drives onto a large platform with a scale under it, sometimes stopping, sometimes not.  The scale measures the truck’s weight and if all is well the truck goes on its way.  It’s all very quick and easy. But it has roots in an earlier transportation system: America’s canals.
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