Do oversize permits cover night travel?
It depends on the state and the load configuration. Most states restrict oversize movement to daylight hours (typically 30 minutes before sunrise to 30 minutes after sunset) on the standard oversize permit. Night travel for oversize loads usually requires special authorization, additional pilot-car requirements, or a separate night-movement permit. Superloads almost always require night-movement restrictions.
Standard oversize permits typically restrict movement to daylight hours for safety reasons — oversize loads are harder for other drivers to perceive at night, and roadside hazards (low overhead clearance, narrow shoulders) are harder for the carrier to spot. The "daylight hours" definition varies by state but most states use 30 minutes before sunrise to 30 minutes after sunset.
Some states allow night travel for routine oversize loads under specific conditions — typically additional pilot car coverage (front and rear pilot cars even on loads that would normally require only one), reflective markers on the load, and reduced speed limits. The conditions are stated on the issued permit; the carrier reviews the permit before departure to confirm what travel windows are authorized.
For superloads, night travel restrictions are stricter and often non-negotiable. Most states prohibit superload movement during peak commute hours regardless of daylight; superloads often run only late-night to early-morning windows when traffic is lightest. The state DOT may also restrict travel on specific routes during specific hours (for example, prohibiting superload movement through urban centers during business hours).
For multi-state oversize moves, the strictest state on the route sets the practical travel window. A move crossing four states where three allow night travel and one restricts to daylight has to comply with the daylight-only state during its segment. Carriers running multi-state oversize moves plan the route segments around each state's restrictions, sometimes adding overnight stops at state lines to wait for the next compliant travel window.