legal gross weight
rev. 2025-01-01 · read 2026-09-05
rev. 2025-01-01 · read 2026-09-05
rev. 2024-09-21 · read 2026-09-05
Both are in effect and neither has been adopted.
State profile · Mississippi
Legal limits, escort triggers, permit fees, the superload line and the police escort position for Mississippi — every figure carrying the state document behind it.
The short version: a Mississippi single-trip permit starts at $10 before bands, overweight and the transaction charge; an escort is first required at 13' or more wide; and the load becomes a superload at a gross weight the state does not publish. Everything below carries the Mississippi document it came from, that document's own revision date, and the date we read it.
Anything over one of these needs a permit. Every value links to the document that sets it.
| Measure | Legal limit |
|---|---|
| Width | 8'6"rev. 2025-01-01 · read 2026-09-05 |
| Height | 13'6"rev. 2025-01-01 · read 2026-09-05 |
| Semitrailer length | 53'rev. 2025-01-01 · read 2026-09-05 |
| Overall length | 99'rev. 2024-09-21 · read 2026-09-05 |
| Kingpin to rear axle | None published |
| Front overhang | 3'rev. 2024-09-21 · read 2026-09-05 |
| Rear overhang | 15'rev. 2024-09-21 · read 2026-09-05 |
| Gross weight | Sources disagree80,000 lb per Table III — 80,000 lb, but only on highways t… — versus — 57,650 lb per Table I — undesignated highways, "36 and grea… — versus — 80,000 lb per cover "PERMIT & MOTOR CARRIER DIVISION MANUAL… |
| Single axle | 20,000 lbrev. 2025-01-01 · read 2026-09-05 |
| Tandem axle | 34,000 lbrev. 2025-01-01 · read 2026-09-05 |
| Measurement | First escort trigger | First police escort trigger |
|---|---|---|
| Width | 13' or morerev. 2024-09-21 · read 2026-09-05 · varies by road class | None published |
| Height | 15'9" or morerev. 2024-09-21 · read 2026-09-05 | 15'9" or morerev. 2024-09-21 · read 2026-09-05 |
| Length | None published | 160' or morerev. 2024-09-21 · read 2026-09-05 |
| Rear overhang | None published | None published |
| Gross weight | None published | 300,000 lb or morerev. 2024-09-21 · read 2026-09-05 |
| Charge | Amount |
|---|---|
| Single-trip base | $10rev. 2024-09-21 · read 2026-09-05 |
| Transaction / card | Not yet covered |
| Route analysis review | Not yet covered |
| Route with no bridges | Not yet covered |
Miss. Code Ann. § 63-5-51 authorises the Mississippi Transportation Commission to "issue a special permit in writing authorizing the applicant to operate or move a vehicle or combination of vehicles of a size or weight of vehicle or load exceeding the maximum specified in this chapter" and sets NO dollar amount, NO formula and NO fee-setting delegation anywhere in subsections (1)(a)-(d) or (2), all of which were read in full. Every Mississippi permit price therefore rests solely on one undated MDOT fee sheet, with no statutory backstop.
Above one of these, the state stops issuing over the counter and prices the move after an engineering review.
| Trigger | Threshold |
|---|---|
| Gross weight | Sources disagreeover 189,999 lb per cover "PERMIT & MOTOR CARRIER DIVISION MANUAL… — versus — 189,999 lb or more per cover "PERMIT & MOTOR CARRIER DIVISION MANUAL… |
| Width | over 17'rev. 2024-09-21 · read 2026-09-05 |
| Height | over 15'7"rev. 2024-09-21 · read 2026-09-05 |
| Length | over 121'rev. 2024-09-21 · read 2026-09-05 |
| Short axle spacing | Not yet covered |
The dimensions at which Mississippi triggers a physical route inspection or an engineering review, and what the agency charges to review it.
| Measurement | Inspection / review trigger |
|---|---|
| Width | over 17'rev. 2024-09-21 · read 2026-09-05 |
| Height | over 15'7"rev. 2024-09-21 · read 2026-09-05 |
| Length | over 121'rev. 2024-09-21 · read 2026-09-05 |
Charges exist and no schedule is published. Mississippi requires two blue-light escorts at 300,000 lb or more and contemplates a discretionary police escort by width, and neither MDOT nor the Mississippi Department of Public Safety publishes an hourly rate, minimum hours, officer minimum, mileage rate or cancellation charge. The Manual says only that "The Mississippi Department of Public Safety (DPS) is authorized to enforce Mississippi laws relating to commercial vehicles".
This is a positive finding: we searched and there is nothing to quote. It is not the same as "no police escort is ever required here".
Holiday, curfew and night-travel windows are not yet encoded for Mississippi.
Mississippi spring thaw restrictions →
They are not guessed at here. What we do publish is the seasonal weight-restriction picture, with the date we last read each state's own bulletin — a curfew invented from a plausible pattern is worth less than an honest gap, because a reader cannot tell the two apart on the page.
The agency behind each figure above is linked from that figure. We publish no per-state permit-office phone number.
We are not publishing per-state permit-office phone numbers yet, and the reason is worth stating: the two seed lists available for them are both demonstrably stale — the federal one gives two different states the same phone number — and a wrong number on a page like this costs somebody a morning. The agency behind each figure above is linked from that figure, which is the part we can stand behind today.
Two official documents, both in effect, giving different answers. Neither has been adopted.
Both are in effect and neither has been adopted.
Both are in effect and neither has been adopted.
Read literally, ".05 cents" is $0.0005 per 1,000 lb per mile and a 100,000 lb load over 100 Mississippi miles costs $1.00 in excess-weight charge. Read as the industry reads it — five cents, $0.05 — the same move costs $100.00. A factor of ONE HUNDRED, in the only document that states a Mississippi permit price. There is NO statutory backstop: Miss. Code Ann. § 63-5-51 authorises the permit and sets no fee, no formula and no fee-setting delegation, and both the Rule and the Manual describe overweight pricing as "based on weight and per mile travel" without a rate. Three further inputs the same sentence never supplies: whether a part-thousand pounds rounds up, down or pro rata; whether mileage is whole miles, rounded or true distance; and WHICH excess the charge runs on, since gross over 80,000, a single axle over 20,000 and a tandem over 34,000 are joined by "or" with no stated basis. Neither reading has been adopted and no Mississippi overweight amount is quoted.
Both documents print a table headed "Maximum Axle Weights and Minimum Spacing / Special Heavy Haul Blanket Permit" and they do not agree on a single row above five axles. SIX AXLES: the Rule prints 80,000-120,000 lb with a 14,000 lb steering axle, a 42,000 lb tandem and a 64,000 lb tri-axle; the Manual prints 80,000-117,000 lb with a 15,000 lb steering axle, a 45,000 lb tandem and a 57,000 lb triaxle. SEVEN AXLES OR MORE: the Rule prints 80,000-150,000 lb with a 56,000 lb tandem and an 80,000 lb quad; the Manual prints 80,000-142,000 lb with a 45,000 lb tandem and a 60,000 lb quad. The Manual also introduces an "Eight Axles or More (80,000 lbs. to 150,000 lbs.)" row the Rule does not have. The differences run to 20,000 lb on a quad group and 8,000 lb of allowed gross. The five-axle row (14,000 / 40,500 / 40,500) is the one row both share. Anyone pricing a Mississippi Special Heavy Haul move must know which table the permit writer is using. Neither has been adopted, and this engine does not price the annual blanket product.
Rule § 900: "Authorizes the movement of loads not exceeding 14 feet in width, 120 feet in length with no more than 14 feet 11 inches rear overhang and must be one continuous piece." — no height at all. Manual: "This permit authorizes the movement of loads not exceeding fourteen (14) feet in width, FOURTEEN (14) FEET IN HEIGHT, one hundred twenty (120) feet in length, with no more than fourteen (14) feet eleven (11) inches rear overhang." A 14 ft 6 in high, 12 ft wide load is inside the Rule’s envelope and outside the Manual’s — covered by the $100 annual blanket under one document and needing a separate single-trip permit under the other.
The fee sheet lists "Pole Blanket $200.00" under Blanket Fees and states that "The Blanket Permits are not prorated, all permits are issued for one (1) year unless otherwise specified". The Manual states "The Pole Blanket Permit is valid for one (1) month at a cost of $200.00 per fleet of vehicles." A twelvefold difference in what $200 buys. The fee sheet’s "unless otherwise specified" arguably yields to the Manual, but the fee sheet does not itself specify otherwise. Both on file; neither adopted.
Named rather than gestured at, because each of these can exceed the permit itself. Every item is listed; open one for why it is excluded.
This is a permit fee, not a freight rate.
We hold no rate data, and the two commercial sites that publish market rates disagree by nearly a factor of two on the same service.
The agency's review fee is shown where the state publishes one; the engineer's own fee is a private cost with no schedule.
Set per move by the agency, and in at least one state the escort is billed at actual cost against it.
Arranged with each utility, priced by each utility.
A toll, bridge or city authority inside the same state issues its own permit, and a state total that omits it is missing a whole permit.
The single-trip base is $10, before the dimension bands, the overweight component and the transaction charge. The base alone is rarely what is paid.
The first width trigger is 13' or more, and it varies by road class — the figure shown is the lowest across classes.
Mississippi publishes no gross-weight superload threshold in the documents on file — see the superload section, which shows the dimensional triggers it does publish.
Yes, in 6 place(s) we hold both documents for. They are set out in full above, each with its pinpoint citation, and none of them has been adopted.