NC posted bridges and weight limits: what truck drivers need to know

The short version

NCDOT sets the safe load for every bridge on the state highway system. When a bridge can't carry legal loads, the limit is posted at each end, and driving over it heavier than posted is a Class 1 misdemeanor. [1]

NC bridge postings show two numbers in tons: one for single vehicles, meaning straight trucks, and one for tractor-trailers. [9]

Our count of NCDOT's February 2026 bridge list found 1,879 posted bridges, about 96 percent of them on secondary roads. Mountain counties have the most. [21]

No weight exception, tolerance, blanket permit or emergency order lets you cross a posted bridge over its limit. Everything here is as of October 2026. [2][14][15]

What the law says and what it costs

G.S. 136-72 gives NCDOT authority to set the safe load-carrying capacity of all state-system bridges. It makes it unlawful for any person, firm or corporation to drive or tow a vehicle over that bridge above the posted gross weight. [1]

A violation is a Class 1 misdemeanor. That is a criminal charge, unlike most NC overweight tickets. [1]

Ordinary overweight violations under G.S. 20-118 are civil penalties assessed by the Highway Patrol on the owner or registrant, not misdemeanors. [2]

For single and tandem axles, the civil penalty is 4 cents a pound for the first 1,000 pounds over, 6 cents for the next 1,000, and 10 cents for each pound after that. [2]

For axle groups over the weight table, it is 2 cents a pound for the first 2,000 pounds, 4 cents for the next 3,000, and 10 cents above 5,000. Each limit you break is counted separately. [2]

Because 136-72 covers any person, firm or corporation, a carrier can face the charge as well as the driver. [1]

G.S. 20-118(g) adds that nothing in the weight statute permits gross weight above a bridge's posted safe capacity. [2]

Reading the two numbers

NCDOT explained its method in a 2016 presentation to legislators. It runs eight legal single-vehicle types through each bridge's analysis, from a 13.5-ton delivery truck to a 42-ton seven-axle hauler. [9]

The lowest result among those eight becomes the single vehicle, or SV, number. Eight legal tractor-trailer types, from 33 to 45 tons, set the tractor-trailer number, called TTST. [9]

NCDOT's example was a Beaufort County bridge on NC 33 over South Creek, posted at 35 tons SV and 43 tons TTST. The current statewide table still lists it that way. [9][5]

The limit is gross vehicle weight in tons of 2,000 pounds. A 22-ton SV posting means a straight truck must weigh 44,000 pounds or less, loaded. [1][9]

In our count of NCDOT's list, 97 posted bridges limit straight trucks but leave tractor-trailers at legal weight. A loaded dump truck can be over the limit on a bridge an 18-wheeler crosses legally. [21]

FHWA has noted that short multi-axle straight trucks, like dump and construction trucks, can stress short bridge spans more than standard tractor-trailers. That is why the SV number is often the lower one. [12]

How many bridges are posted, and where

NCDOT says it maintains about 13,800 bridges. As of January 2026, about 1,300 were in poor condition, and NCDOT notes poor bridges may need weight limits. [20]

Our count of the February 2026 list: 1,879 posted bridges. Of those, 357 have a straight-truck limit of 15 tons or less, and 72 are at 10 tons or less. [21]

The mountain divisions, 11, 13 and 14, hold 57 percent of posted bridges. Rutherford County had the most at 97, then Buncombe at 85 and Macon at 79. [21]

FHWA's national bridge inventory counted 1,841 NC bridges posted for load as of June 2025. It counts local bridges too, so the numbers don't match exactly. [17]

Most posted bridges are old and not in good shape. In our count, half were built in 1962 or earlier, 608 were rated poor and 1,192 fair. FHWA also listed 143 NC bridges as closed in June 2025. [21][17]

Only 58 posted bridges were on NCDOT's primary-route table dated Oct. 9, 2026. One example is US 301 and NC 96 over the CSX line in Johnston County, posted at 18 tons SV and 22 TTST. [5]

Helene left temporary bridges in the mountains, and some carry low limits. In January 2026, 828newsNOW reported NCDOT posted 15 tons on a temporary Hollywood Road bridge in Fairview. [19]

NCDOT said in July 2026 that more than 99 percent of roads Helene closed had reopened. The US 176 stretch between Saluda and Tryon was still closed, with repairs due to finish in late 2029. [23]

Light-traffic roads

A light-traffic road is a state road NCDOT posts to limit axle weight below the normal limits. It can never be an interstate, US or NC route. [2]

NCDOT may post one when the road can't carry maximum axle weights without damage. The signs must show the maximum axle weight allowed. [2]

That is different from a bridge posting. A bridge limits gross weight in tons; a light-traffic road limits weight per axle. [2][14]

Some farm, forest and local delivery loads may use light-traffic roads to reach the nearest regular road. NCDOT can end those exceptions on a road being damaged and post it for no exemptions. [2]

We found no seasonal or spring-thaw posting rule in NC law. NCDOT says roads come off its posted list as they are strengthened. [2][8]

Exceptions, permits and emergency orders don't override a posting

The 10 percent axle-group tolerance does not apply to a vehicle over a posted bridge limit. [2]

The 90,000-pound exceptions for farm, forest, metal commodity and construction equipment loads all carry the same condition: no exceeding posted bridge limits. Our weigh station and log truck guides cover those exceptions. [2]

The metal commodity and construction equipment exception, for example, allows 22,000 pounds on a single axle, 42,000 on a tandem and 90,000 gross, but only off interstates, off light-traffic roads and within posted bridge limits. [2]

Federal weight allowances under 23 U.S.C. 127 apply on NC roads, but not on a posted road or posted bridge. [2]

NCDOT's permit handbook says the annual 90,000-pound overweight permit does not authorize travel on posted roads or bridges. The one-mile allowance off a permitted interstate route applies only if no bridge is crossed. [14]

Emergency permits are issued only where posted road and bridge limits allow. Hurricane Helene's Executive Order 315 and January 2026's Executive Order 31 both kept posted bridge limits in force. [3][15][16]

The federal rules behind the numbers

Federal bridge rules require states to load-rate each bridge and to post it within 30 days once a rating shows it can't carry legal loads. [11]

Missing or unreadable posting signs must be fixed within 30 days of an inspection or notice. A bridge must be closed if its capacity falls below 3 tons. [11]

NCDOT's Oct. 9, 2026 table shows how that looks: two closed NC 211 bridges in Brunswick County are listed at 1 ton for both limits. [5]

States must also check permit loads against each bridge they cross. That is why route-specific permits over 90,000 pounds take bridge engineering review. [11][14]

How to check a route before dispatch

NCDOT's truck network page links its posted bridge maps, posted roads and bridge information. The maps cover interstates, US and NC routes by division. [24][4]

For secondary roads, NCDOT's statewide bridge list in PDF and Excel shows every bridge's posting status and both limits. It is current as of January 2026. [20][21]

The maps say they are not a legal document. The sign at the bridge is what counts, and NCDOT's Structures Management Unit at 919-707-6400 takes questions. [6][1]

For posted roads in a county, NCDOT points drivers to the district engineer. If your load is over a posting, NCDOT says to contact its Oversize/Overweight Permits Unit. [8][20]

Our advice, not a rule: dispatchers sending straight trucks onto rural or mountain roads should check the SV numbers on the bridge list before the truck rolls. [21]