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TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 476: Practices for Permitting Superheavy Load Movements on Highway Pavements documents the practices followed in issuing permits for overweight and superheavy commercial vehicles (SHCVs) or “superloads.” Superloads are trucks that exceed the thresholds set for overweight vehicles, but are allowed to operate with annual permits throughout state highway networks.
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