Legal Weight Limits
Maryland follows the federal gross weight limit of 80,000 lbs and adopts the federal Bridge Formula for axle groups. A single axle is limited to 22,400 lbs (20,000 lbs for vehicles registered over 73,000 lbs), and a tandem to 34,000 lbs. On non-interstate highways, Maryland allows a 1,000 lb tolerance above legal limits (so long as gross weight doesn’t exceed 80k or a valid permit is in hand) before an overweight violation is cited. There are no special higher state weight limits beyond the federal standard without a license, and anything over legal limits needs an MDOT SHA hauling permit.
Overweight Fine Structure
Maryland’s fines are graduated by the amount of excess weight. The first 1,000 lbs of overweight costs 1 cent per pound; 1,001–5,000 lbs is 5 cents per pound; 5,001–10,000 lbs is 12 cents per pound; 10,001–20,000 lbs is 20 cents per pound; and any weight beyond 20,000 lbs over the limit is 40 cents per pound. (On the Chesapeake Bay Bridge, the penalties are roughly doubled – up to 80 cents per pound over 20k excess .) These fines cannot be waived or reduced by courts, and a credit is only given for the weight attributable to snow/ice accumulation. Maryland also impounds out-of-state trucks until fines are paid (or bond posted) and may auction the vehicle after 90 days if unpaid.
Enforcement Methods
The Maryland State Police and Transportation Authority Police operate 13 permanent weigh & inspection stations statewide, supplemented by four pull-off sites with portable scales. Many sites use weigh-in-motion sensors to pre-screen trucks for weight violations. Officers (including certified civilian inspectors) can stop any truck and require it to be weighed – either on stationary scales or portable scales – when they have reason to believe it is over limits. Truck drivers must obey signals (including electronic transponder signals) to report to a scale, and failing to stop or submit to weighing is a serious offence. Refusing a weigh directive allows officers to take the vehicle into custody for weighing, and carries fines up to $1,000 for a first offence, $2,000 for a second, and $3,000 for a third. If a truck is found overweight at a scale, the driver must offload the excess cargo before proceeding (carriers are responsible for the material and its security). Maryland employs random roadside weight enforcement via portable scales, and it uses Drivewyze PreClear electronic screening to allow compliant trucks to bypass weigh stations electronically. Bypass misuse or attempting to evade a scale can trigger enforcement action.