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.
Corridor
1. Where the load goes next
The jurisdictions this one borders, each chip carrying the fact that decides whether that crossing is the expensive one — so the row is itself a small comparison. A multi-state lane is the actual job, and from here it is one click per state rather than a return to an alphabetical index.
Anything over one of these needs a permit. Every value links to the document that sets it.
Measure
Legal limit
Width
8'6"rev. · read secondary host§ 63-5-13(1): "the total outside width of any vehicle, exclusive of required safety devices, or the load thereon shall not exceed eight and one-half (8-1/2) feet". Exclusive. The 9 ft 6 in allowance for unprocessed forest products off the interstate, and the 10 ft 6 in side-by-side manufactured-products permit envelope, are commodity-conditioned and are recorded rather than applied.
Height
13'6"rev. · read secondary hostTWO HEIGHTS IN ONE SENTENCE. § 63-5-17 sets the permit trigger at 13 ft 6 in and then makes 12 FT 6 IN A LIABILITY LINE: "no person, firm or corporation, or the State of Mississippi or any subdivision thereof, shall be required to raise, alter, construct or reconstruct any underpass, wire, pole, trestle, or other structure to permit the passage of any vehicle having a height ... in excess of twelve feet, six inches. Full liability for damage to any structure caused by any vehicle having a height in excess of twelve feet, six inches, shall be borne entirely by the motor carrier or operator." Nothing in this model records a liability threshold; it is worth stating on any Mississippi lane over 12 ft 6 in.
Semitrailer length
53'rev. · read secondary host§ 63-5-19(2): "No semitrailer operating in a truck tractor-semitrailer combination and no trailer drawn by a motor vehicle shall exceed a length of fifty-three (53) feet."
Overall length
99'rev. · read Manual § 11: "Vehicles with a total length exceeding ninety-nine (99) feet will require a permit and a front and/or rear escort", and "A Single Trip – Oversize Permit must be purchased if the truck, trailer or load exceeds ... ninety-nine (99) feet in length". Exclusive. NO STATUTORY COUNTERPART WAS LOCATED: Miss. Code Ann. § 63-5-19 was opened in full and sets no overall combination length limit.
Kingpin to rear axle
None published
Front overhang
3'rev. · read Manual § 10: "Front projection exceeding three (3) feet will require a permit." Exclusive. The escort trigger in the same sentence is INCLUSIVE at 15 ft and is carried by ms-front-projection-15-escort-count-indeterminate.
Rear overhang
15'rev. · read Manual § 9: "A rear overhang of fifteen (15) feet or greater will require a permit and a front and/or rear escort." THE TRIGGER IS INCLUSIVE and this field is tested exclusively, so the boundary case — exactly 15 ft 0 in — is carried by ms-rear-overhang-15-escort-count-indeterminate, which fires at 15 ft or more.
20,000 lbrev. · read secondary host§ 63-5-27(2), and note "EXCLUSIVE OF THE TOLERANCE provided in Section 63-5-33" — unlike South Carolina’s and Michigan’s interstate figures, which are stated as INCLUDING tolerances. MDOT’s fee sheet uses the same figure as an overweight-charge trigger: "over axle for weights exceeding 20,000 lbs. on a single axle". § 63-5-27(1) adds a second, independent constraint this model cannot evaluate: "the gross single or tandem axle weights shall not exceed five hundred fifty (550) pounds per inch of tire width", with a 500 lb tolerance. Tyre width is not collected on a quote; on a 20,000 lb single axle that rule binds unless the tyres total at least 36.4 in of width.
Tandem axle
34,000 lbrev. · read secondary host§ 63-5-27(3): "The gross weight imposed on the highway by any tandem axle shall not exceed thirty-four thousand (34,000) pounds exclusive of the tolerance provided in Section 63-5-33. A tandem axle shall be defined as any two (2) or more consecutive axles whose centers are more than forty (40) inches but not more than ninety-six (96) inches apart."
Not one number per dimension — the whole staircase. Each row is a condition the state actually publishes, what it requires when that condition holds, and the clause it comes from. Where a rule requires escorts and the source states no number, the row says that in the source's own words rather than reporting no requirement.
When
What is required
Source
width of 13' or more and the road is “divided” or “multilane undivided” or “interstate”
1 in front1 police escort in front1 police escort behindHeight pole requiredAdvisory: Manual, Super Load requirements iii: "Two blue light escorts along with a height pole escort will be required on loads starting at fifteen (15) feet (9) inches tall or more." (The "(9) inches" is a typographical slip for "nine (9) inches" and is reproduced as printed.) THREE escorts at 15 ft 9 in against ONE height pole at 15 ft 7 in — a two-inch band. Not in the 2020 Rule. The two officers are unpriced.
1 police escort in front1 police escort behindAdvisory: Manual, Super Load requirements ii: "Two blue light escorts (one front/ one rear) on all loads beginning at one hundred sixty (160) feet in total length." Inclusive, and not in the 2020 Rule. Unpriced — Mississippi publishes no officer rate.
1 police escort in front1 police escort behindAdvisory: Manual, Super Load requirements iv: "Two blue light escorts are required for loads 300,000 pounds or more. Exceptions may be allowed at the discretion of the MDOT Permit Division Director, based on the load’s route." Inclusive. This is Mississippi’s ONLY weight-keyed escort rule and it is NOT in the 2020 Commission Rule, which has no weight escort trigger at all. Mississippi publishes no law-enforcement escort rate, so the two officers are required and unpriced.
The agency prices it; no published schedule. Miss. Code Ann. § 63-5-51 authorises the Mississippi Transportation Commission to issue the permit but sets no dollar amount or formula. Issued ExpressPass permits now corroborate the gross-weight formula, while axle-only pricing, charged-mile selection and rounding remain outside the statute and incomplete for an advance quote.
Rounding is not a detail here: the same rate over the same miles can differ by a whole increment depending on which pounds are rounded and in which direction, so the rule is printed with the source's own words rather than applied silently.
Gross weight
Axles
Rate and rounding
Source
80,001 lb and up
any
$0.05 per mile for each 1,000 lb above 80,000 lba part increment is not charged
A permit priced against an unposted-road assumption in March is simply wrong, and wrong in the expensive direction. This is the window we watch, the basis for that window in the state's own orders or statute, and the authority that posts it.
Mississippi is not in the seasonal-restriction registry, so we hold no posting window for it and are not inventing one.
Superload
7. Mississippi's superload threshold
Above one of these, the state stops issuing over the counter and prices the move after an engineering review.
over 17'rev. · read Manual: "A Super Load is considered to be any vehicle that exceeds any of the following limits: 1. Overall Width of seventeen (17) feet." Exclusive via the stem. Rule § 800.1 identical.
Height
over 15'7"rev. · read Manual: "3. Overall Height of fifteen (15) feet seven (7) inches." Exclusive via the stem, and the same figure as the height-pole trigger — the pole attaches at the moment a load becomes a superload.
Length
over 121'rev. · read Manual: "2. Overall Length of one hundred twenty-one (121) feet." Exclusive via the stem. Rule § 800.2 identical.
over 121'rev. · read Manual: "A route survey must include ... Route(s) surveyed. List of obstructions such as highway signs (roadside and overhead), bridge rails, overhead traffic signals, and overhead power lines, railroad crossings on the route or shoulders affecting the move. Pull-off areas to allow traffic to pass". Rule § 803 identical. MDOT publishes no charge for it and no lead time for a Mississippi superload.
Police escorts
9. Police escorts
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. The seasonal picture — which is a different question — is in section 6 above.
Why those windows are absent rather than estimated
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.
Who issues it
11. Permit office
The agency behind each figure above is linked from that figure. We publish no per-state permit-office phone number.
Why there is no phone number here
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.
Source conflicts
12. Where the sources disagree
Two official documents, both in effect, giving different answers. Neither has been adopted.
80,000 lbMiss. Code Ann. § 63-5-33 (via FindLaw — SECONDARY source) — Table III — 80,000 lb, but only on highways the Commission has designated as capable of the maximum load limits; the federal bridge formula; FindLaw states "Current as of January 01, 2025" rev. · read
57,650 lbMiss. Code Ann. § 63-5-29 (via FindLaw — SECONDARY source) — Table I — undesignated highways, "36 and greater — 57,650 maximum", measured longitudinally to the nearest foot; FindLaw states "Current as of January 01, 2025" rev. · read
over 189,999 lbMDOT — Permit & Motor Carrier Division Manual (9/21/2024) — cover "PERMIT & MOTOR CARRIER DIVISION MANUAL 9/21/2024"; definitions 2, 3, 4, 15, 18, 19, 21; General Permit Regulations; Super Load section rev. · read
189,999 lb or moreMDOT — Permit & Motor Carrier Division Manual (9/21/2024) — cover "PERMIT & MOTOR CARRIER DIVISION MANUAL 9/21/2024"; definitions 2, 3, 4, 15, 18, 19, 21; General Permit Regulations; Super Load section rev. · read
Both are in effect and neither has been adopted.
Issued permits resolve the gross rate; billing inputs still require review
Three MDOT-issued permits operationally resolve the undated fee sheet’s ".05 cents" typo for demonstrated gross-overweight moves: 40,000 lb over 80,000 across 95 charged miles produced $190; 43,000 lb across 120 charged miles produced $258; and 48,000 lb across 77 charged miles produced $184.80. Each is $0.05 per 1,000 lb of gross excess per charged mile. This is a planning allowance, not an exact permit quote: the permits do not settle partial-1,000-lb rounding; route detail of 120.50 miles was billed as 120 while a previously retrieved 94.90-mile route was billed as 95, which does not prove a universal mileage rule; and no example resolves axle-only violations. The actual MDOT-approved route, charged miles, axle comparison, approval conditions and any extra review costs must still be confirmed.
MISSISSIPPI_GROSS_OVERWEIGHT_FEE_EVIDENCE
A heavy-haul axle table rewritten wholesale between two live documents
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.
MISSISSIPPI_SPECIAL_HEAVY_HAUL_TABLE_CONFLICT
An annual blanket envelope that gains a height limit in one document
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.
MISSISSIPPI_BLANKET_ENVELOPE_CONFLICT
The same $200 permit lasts a year in one document and a month in 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.
FHWA — Pilot/Escort Vehicle Operator (P/EVO) Best Practices Guide — Federal Highway Administration — "As of early 2016, States that require P/EVOs be certified include Arizona, Colorado, Florida, Georgia, Minnesota, New York, North Carolina, Oklahoma, Utah, Virginia, and Washington." undated document · read
MDOT — Over-Dimensional Permits, Sub-Part 6601 Ch. 03001 (Commission Rule) — Mississippi Transportation Commission, published with the Mississippi Secretary of State — §§ 200, 201, 213, 301, 308-313, 318, 400, 403, 800-804, 900; no printed revision date; PDF created 2020-04-01 undated document · read
MDOT — Permit & Motor Carrier Division Manual (9/21/2024) — Mississippi Department of Transportation — cover "PERMIT & MOTOR CARRIER DIVISION MANUAL 9/21/2024"; definitions 2, 3, 4, 15, 18, 19, 21; General Permit Regulations; Super Load section rev. · read
MDOT — Permit and Blanket Fees (ExpressPass) — Mississippi Department of Transportation — Flat Permit Fees and Blanket Fees; no printed revision date; PDF created 2019-11-14 undated document · read
MDOT issued permit #24153204 — Mississippi Department of Transportation, ExpressPass — 123,000 lb loaded; 43,000 lb overweight; "$0.05 = 2.15 x 120"; $258 OW plus $10 OS; route detail totals 120.50 mi rev. · read
MDOT issued permit #25128017 — Mississippi Department of Transportation, ExpressPass — 128,000 lb loaded; 48,000 lb overweight; "$0.05 = 2.4 x 77"; $184.80 OW plus $10 OS rev. · read
MDOT issued permit #issued-example-2194435 — Mississippi Department of Transportation, ExpressPass — Previously retrieved issued example: 120,000 lb loaded; 40,000 lb overweight; 95 charged mi; $190 OW plus $10 OS. The endpoint returned "PDF access restricted" on 2026-10-13. rev. · read
Miss. Code Ann. § 63-5-17 (via FindLaw — SECONDARY source) — FindLaw, reproducing the Mississippi Code Annotated — height 13 ft 6 in, and the separate 12 ft 6 in liability line; FindLaw states "Current as of January 01, 2025" rev. · read secondary host
Miss. Code Ann. § 63-5-19 (via FindLaw — SECONDARY source) — FindLaw, reproducing the Mississippi Code Annotated — single vehicle 40 ft; semitrailer 53 ft; three-unit trailer 30 ft; the 28 ft forest-product rear projection; NO overall combination length; FindLaw states "Current as of January 01, 2025" rev. · read secondary host
Miss. Code Ann. § 63-5-27 (via FindLaw — SECONDARY source) — FindLaw, reproducing the Mississippi Code Annotated — 20,000 lb single axle and 34,000 lb tandem, exclusive of the § 63-5-33 tolerance; 550 lb per inch of tyre width; FindLaw states "Current as of January 01, 2025" rev. · read secondary host
Miss. Code Ann. § 63-5-29 (via FindLaw — SECONDARY source) — FindLaw, reproducing the Mississippi Code Annotated — Table I — undesignated highways, "36 and greater — 57,650 maximum", measured longitudinally to the nearest foot; FindLaw states "Current as of January 01, 2025" rev. · read secondary host
Miss. Code Ann. § 63-5-33 (via FindLaw — SECONDARY source) — FindLaw, reproducing the Mississippi Code Annotated — Table III — 80,000 lb, but only on highways the Commission has designated as capable of the maximum load limits; the federal bridge formula; FindLaw states "Current as of January 01, 2025" rev. · read secondary host
Miss. Code Ann. § 63-5-51 (via FindLaw — SECONDARY source) — FindLaw, reproducing the Mississippi Code Annotated — the permit authority itself — subsections (1)(a)-(d) and (2) read in full, and NO fee, formula or fee-setting delegation appears anywhere in it; FindLaw states "Current as of January 01, 2025" rev. · read secondary host
Common questions
Questions
How much is an oversize permit in Mississippi?
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.
When does Mississippi require a pilot car?
The first width trigger is 13' or more, and it varies by road class — the figure shown is the lowest across classes.
What is a superload in Mississippi?
Mississippi publishes no gross-weight superload threshold in the documents on file — see the superload section, which shows the dimensional triggers it does publish.
Do Mississippi's own documents contradict each other?
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.