What is a superload?
An oversize load that exceeds state-specific superload thresholds — typically anything over 16 feet wide, 17 feet tall, 200 feet long, or 200,000 lbs gross. Superloads require additional engineering review by the state DOT before a permit issues, route studies, and often police escort. Lead time is 5-15 business days, much longer than standard oversize.
Superload thresholds vary by state. Most states draw the line at 16' wide, 17' tall, 200' long, or 200,000 lbs gross. Some states (Texas, Wyoming, Montana) have higher dimensional thresholds before a load is classified as superload; others (East Coast states with older infrastructure) have lower thresholds.
Superload permits trigger an engineering review: the state DOT studies the proposed route for bridge ratings, overhead clearances, turn radii, and roadway capacity. Routes the engineer rejects require alternative paths or load reconfiguration. Some superloads are rerouted hundreds of miles around inadequate corridors.
Police escort is typically required for superloads — front, rear, and sometimes additional pole-cars depending on dimensions. The carrier coordinates with state police or contracted escort services; the permit specifies the escort requirements.
Permit fees for superloads are substantially higher than standard oversize — typically $500-$5,000 per state per trip depending on dimensions and engineering complexity. Lead time for engineering review is 5-15 business days, so superload moves require advance planning.