New Hampshire Oversize / Overweight Permit Requirements
Legal-without-permit dimension limits, escort and pilot car thresholds, height pole rules, daylight-only windows, and holiday restrictions for New Hampshire oversize moves.
Legal limits without a permit
In New Hampshire, you can move a load without an OSOW permit up to these dimensions on the Interstate and designated highways. Anything over the limits requires a permit (and may require escorts — see below).
| Dimension | Without a permit | Permit required when |
|---|---|---|
| Width | 8′6″ (federal limit) | Anything wider |
| Height | 13′6″ | Anything taller |
| Combo length | 75′0″ | Anything longer |
| Gross weight | 80,000 lb | Anything heavier |
Escort and pilot car thresholds
When permitted, the following escort or movement-restriction rules apply in New Hampshire. Thresholds are conservative — your specific permit conditions may impose tighter limits depending on the route.
| Trigger | Dimension | Threshold | Detail |
|---|---|---|---|
| Police escort | Length | 100'0" | Length 100' or greater: 1 state police escort required. |
| Front pilot car | Length | 90'0" | Length 90' or greater: 1 civilian front escort required. |
| Front pilot car | Rear overhang | 15'0" rear overhang | Rear overhang 15' or greater with width 12' or greater: 2 civilian escorts required (front + rear). |
| Rear pilot car | Rear overhang | 15'0" rear overhang | Rear overhang 15' or greater with width 12' or greater: 2 civilian escorts required (front + rear). |
| Front pilot car | Front overhang | 15'0" front overhang | Front overhang 15' or greater: 1 civilian escort required. |
| Police escort | Width | 14'0" | Width over 14': 2 state police escort vehicles required (per permit table). |
| Front pilot car | Height | 14'0" | Height over 14': 1 civilian front escort required. |
| Front pilot car | Width | 12'0" | Width 12'–14': 1 civilian front escort required. |
| Daylight-only movement | Width | 12'0" | Travel permitted 1/2 hr before sunrise to 1/2 hr after sunset only. |
| Weekend / holiday restriction | Width | 12'0" | No travel on Saturdays, Sundays, legal holidays, or the day following a legal holiday. |
Stop tracking these rules by hand.
OverSizeTMS encodes the per-state escort and dimension rules for every state plus DC. Enter the load dimensions and route, and the platform tells you which permits, escorts, and time windows apply automatically.
See how it works →Last updated 2026-06-06. Single-source or pending re-verify — confirm with the permit office.