New Hampshire Truck Weight Limits and Permit Sources

At-a-glance summary

Field-level reference data

New Hampshire’s weight review has three well-confirmed official sources: NHDOT for permits, New Hampshire State Police Troop G for enforcement, and RSA 266:25 for the penalty framework. Having all three in place makes this a more complete sourcing picture than states where enforcement or fine fields remain open. New Hampshire’s compact geography and dense road network make bridge formula compliance particularly relevant.

Reading the New Hampshire weight table

Weight rows use the federal Interstate baseline and the FHWA state law compilation for New Hampshire. New Hampshire’s I-93, I-95, and I-89 corridors carry Northeast freight. Federal baseline applies on those routes. For state routes and local roads — including routes serving timber, agriculture, and seasonal recreation industries — verify the FHWA state law compilation and any permit conditions.

New Hampshire’s older bridge infrastructure and covered bridges on local routes can impose lower effective limits. Current bridge postings for specific routes are worth checking when the move uses secondary or rural roads.

Permit and route authority in New Hampshire

NHDOT Oversize/Overweight Permits handles over-limit permits for New Hampshire. Applications go through NHDOT’s current permit system. New Hampshire permits cover route, dates, vehicle configuration, and axle weights. Changes to equipment or routing require permit review.

Seasonal, route, and local checks

No statewide frost-law or seasonal weight restriction was confirmed for New Hampshire in this review. New Hampshire has spring thaw conditions that can affect local roads, and municipalities have authority over local road restrictions. For moves that use local roads in late winter or spring, checking with local road authorities is the right step.

Tickets and enforcement notes

New Hampshire State Police Troop G is the confirmed enforcement agency for commercial vehicle enforcement. RSA 266:25 is the official statute reviewed for weight violation penalty context. For any citation, the specific RSA section, excess weight, and court instructions are the controlling documents.

Source-strength notes for New Hampshire

This page draws from 6 source records. Coverage spans 3 high-confidence, 23 medium-confidence, and 3 low-confidence fields. Permit, enforcement, and fine statute fields are well-supported — each has direct official backing. Seasonal is the area where confidence is lowest on this page.

Building a New Hampshire source file

A New Hampshire dispatch file should include NHDOT permit documentation, current scale ticket, approved route, and the RSA 266:25 reference. For Northeast I-93 and I-95 corridor planning, the axle weight table, permit office list, seasonal restrictions, and overweight fines pages support multi-state planning.

How to Read a CAT Scale Ticket covers ticket reading. How to Slide Tandems covers distribution. Bridge Formula Explained covers bridge spacing on New Hampshire’s older infrastructure.