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<p>An "Exempt" sign is applied to some railroad crossings to indicate that school buses and trucks carrying hazardous materials are not required to stop and look for trains before crossing. This doesn't always mean the line is embargoed or abandoned, sometimes they could block a dangerous intersection while stopping for the crossing, which is ruled to be "more dangerous" than a train-vehicle collision. I believe this is decided by a court of some kind. Others are welcome to elaborate.<br></p>
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