MS
Mississippi oversize permit rules
What Mississippi charges for a single-trip OS/OW permit, the limits that trigger one, and the escort thresholds — read from the state’s own publication. This rule has been in effect since 2024-01-01; we last read the source on 2026-07-12.
Oversize permit
$10
One price for a single-trip permit, whatever the dimensions. A 9-foot-wide load and a 16-foot-wide load pay the same.
Overweight permit
Quoted per load
Scales with distance and weight — there is no single figure.
+ $20 Permigo service fee per permit, state fees at cost.
Legal limits
Exceed any one of these in Mississippi and you need a permit for this state.
| Limit | Interstate |
|---|---|
| Width | 8'6" |
| Height | 13'6" |
| Length | 80'0" |
| Gross weight | 80,000 lbs |
| Single axle | 20,000 lbs |
| Tandem axle | 34,000 lbs |
| Tridem axle | 42,000 lbs |
| Trailer length | 53'0" |
What the permit costs
Mississippi prices a single-trip permit as flat rate. One price for a single-trip permit, whatever the dimensions. A 9-foot-wide load and a 16-foot-wide load pay the same.
Escort requirements
Thresholds by road class. Where two classes differ, the road you are actually on governs.
Interstate / divided multilane
| Width | Requirement |
|---|---|
| 10'0" and over | 1 rear escort (night only)Night moves at 10' wide or more take an escort (front on two-lane / rear on divided, Gen. Reg. 13) plus rear-mounted flashing ambers; under 10' wide at night, ambers only — 'No escort is required.' Night envelope: ≤12'W / ≤150,000 lb / ≤99'L / height 13'6" (route-dependent above) / max 4' rear overhang; forestry/ag products get a statutory night allowance (§63-5-19). |
| 13'0" and over | 1 rear escortLoads 13' wide or greater on divided highways: rear escort (Gen. Reg. 18 — the permit-printed 'Rear 4 Lane' rule).Escorts may be required when crossing bridges on a permitted route (Manual Gen. Reg. 18); missing a required escort risks up to 30 days' permit suspension (Safety Req. 2). |
| Over 17'0" | route survey · superloadWidth exceeding 17' = Super Load (Manual p.12): carrier-performed route survey (routes, obstructions, pull-off areas), TCP with encroachment points + stop-traffic plan, axle/tire diagrams; standard OS+OW pricing (no superload line item). |
| Over 18'0" | Marking required18' wide and over: a police ('blue lights') escort MAY be required 'depending on the route and load conditions, and at the discretion of the Executive Director or the Commission' (Gen. Reg. 18 — DISCRETIONARY,) |
| Height | Requirement |
|---|---|
| 15'7" and over | 1 pole car · height pole15'7" tall or more: 'A height pole will be required' (Manual p.13) — ONE escort vehicle carrying the pole (position not codified in MS; the pole class bills one vehicle). At EXACTLY 15'7" the pole binds but Super Load does not (the superload line reads 'exceeds'). |
| Over 15'7" | route survey · superloadHeight exceeding 15'7" = Super Load (Manual p.12). Utility AND railroad written acknowledgments at heights exceeding 16'7" (raised from the 2020 rules' 16'0"). |
| 15'9" and over | 2 police escorts15'9" tall or more: 'Two blue light escorts along with a height pole escort will be required' (Manual p.13 verbatim; director-discretion exceptions possible). |
| Length | Requirement |
|---|---|
| Over 99'0" | 1 rear escortTotal length exceeding 99': permit + 'a front and/or rear escort' (Gen. Reg. 11 verbatim — the rule leaves the position open;) |
| Over 121'0" | route survey · superloadLength exceeding 121' = Super Load (Manual p.12;) |
| 160'0" and over | 2 police escorts'Two blue light escorts (one front/ one rear) on all loads beginning at one hundred sixty (160) feet in total length' (Manual p.13 verbatim). |
| Front overhang | Requirement |
|---|---|
| 15'0" and over | 1 front escortFront projection 15' or greater: permit + 'front and/or rear escort' (Gen. Reg. 10; front) |
| Rear overhang | Requirement |
|---|---|
| 15'0" and over | 1 rear escortRear overhang 15' or greater: permit + 'front and/or rear escort' (Gen. Reg. 9; rear) |
| Weight | Requirement |
|---|---|
| 189,999 lbs and over | route survey · superload'Gross Weight of 189,999 pounds or greater' = Super Load (Manual p.12 verbatim — yes, 189,999 exactly qualifies; the old ≥190,000 operator was one pound high). Carrier route survey + TCP; standard OS+OW pricing. |
| 300,000 lbs and over | 2 police escorts'Two blue light escorts are required for loads 300,000 pounds or more' (Manual p.13 verbatim; director may require more or allow alternates). |
Two- or three-lane undivided
| Width | Requirement |
|---|---|
| 10'0" and over | 1 front escort (night only)Night moves at 10' wide or more take an escort (front on two-lane / rear on divided, Gen. Reg. 13) plus rear-mounted flashing ambers; under 10' wide at night, ambers only — 'No escort is required.' Night envelope: ≤12'W / ≤150,000 lb / ≤99'L / height 13'6" (route-dependent above) / max 4' rear overhang; forestry/ag products get a statutory night allowance (§63-5-19). |
| 13'0" and over | 1 front escortLoads 13' wide or greater on a two-lane roadway: front escort + flashing ambers on the load's rear (Manual Gen. Reg. 18 — the permit-printed 'Front 2 Lane' rule).Escorts may be required when crossing bridges on a permitted route (Manual Gen. Reg. 18); missing a required escort risks up to 30 days' permit suspension (Safety Req. 2). |
| Over 17'0" | route survey · superloadWidth exceeding 17' = Super Load (Manual p.12): carrier-performed route survey (routes, obstructions, pull-off areas), TCP with encroachment points + stop-traffic plan, axle/tire diagrams; standard OS+OW pricing (no superload line item). |
| Over 18'0" | Marking required18' wide and over: a police ('blue lights') escort MAY be required 'depending on the route and load conditions, and at the discretion of the Executive Director or the Commission' (Gen. Reg. 18 — DISCRETIONARY,) |
| Height | Requirement |
|---|---|
| 15'7" and over | 1 pole car · height pole15'7" tall or more: 'A height pole will be required' (Manual p.13) — ONE escort vehicle carrying the pole (position not codified in MS; the pole class bills one vehicle). At EXACTLY 15'7" the pole binds but Super Load does not (the superload line reads 'exceeds'). |
| Over 15'7" | route survey · superloadHeight exceeding 15'7" = Super Load (Manual p.12). Utility AND railroad written acknowledgments at heights exceeding 16'7" (raised from the 2020 rules' 16'0"). |
| 15'9" and over | 2 police escorts15'9" tall or more: 'Two blue light escorts along with a height pole escort will be required' (Manual p.13 verbatim; director-discretion exceptions possible). |
| Length | Requirement |
|---|---|
| Over 99'0" | 1 front escortTotal length exceeding 99': permit + 'a front and/or rear escort' (Gen. Reg. 11 verbatim — the rule leaves the position open;) |
| Over 121'0" | route survey · superloadLength exceeding 121' = Super Load (Manual p.12;) |
| 160'0" and over | 2 police escorts'Two blue light escorts (one front/ one rear) on all loads beginning at one hundred sixty (160) feet in total length' (Manual p.13 verbatim). |
| Front overhang | Requirement |
|---|---|
| 15'0" and over | 1 front escortFront projection 15' or greater: permit + 'front and/or rear escort' (Gen. Reg. 10; front) |
| Rear overhang | Requirement |
|---|---|
| 15'0" and over | 1 rear escortRear overhang 15' or greater: permit + 'front and/or rear escort' (Gen. Reg. 9; rear) |
| Weight | Requirement |
|---|---|
| 189,999 lbs and over | route survey · superload'Gross Weight of 189,999 pounds or greater' = Super Load (Manual p.12 verbatim — yes, 189,999 exactly qualifies; the old ≥190,000 operator was one pound high). Carrier route survey + TCP; standard OS+OW pricing. |
| 300,000 lbs and over | 2 police escorts'Two blue light escorts are required for loads 300,000 pounds or more' (Manual p.13 verbatim; director may require more or allow alternates). |
Movement restrictions
| Restriction | In Mississippi |
|---|---|
| Night travel | Daylight hours only |
| Weekends | No blanket restriction |
| Holidays | Restricted |
Movement hours (Manual 1/13/2026, verified 2026-07-12)
| Load | Window |
|---|---|
| ≤12′ wide | sunrise → sunset (NWS) |
| >12′ wide | 30 min after sunrise → 30 min before sunset |
| Night envelope: ≤12′W · ≤150,000 lb · ≤99′L · ≤13′6″H (route-dependent above) · ≤4′ rear OH | night moves permitted; ≥10′ wide takes the escort flip + rear ambers; <10′ ambers only |
| Forestry/ag natural-state products | day OR night with marking (§63-5-19 — the old daylight-only clause is gone) |
| 6 holidays | no movement after 12:00 noon the day before or on: New Year's, Memorial, July 4, Labor, Thanksgiving, Christmas |
| Weekends | open for single-trip permits (SHE blanket 12–14′W: Mon–Sat; hay/ag: daylight) |
| Weather | no overwidth movement in inclement weather; visibility <500′ or hazardous wind/pavement = stop |
Where these permits come from
If you file yourself, this is the office you are dealing with. Check the linked page — some states issue OS/OW permits through their highway patrol or revenue department rather than the DOT.
| Mississippi permit office | |
|---|---|
| Permit office | 601-359-1717 |
| [email protected] | |
| Permit portal | ExpressPass — permits.mdot.ms.gov (instant issuance for standard OS/OW; auto-routing around low bridges/postings; e-permits on phones accepted). Prerequisites: USDOT # AND $500k COI naming MDOT (conjunctive since 2026) + UCR/IFTA/IRP current |
| Information | Official page |
MDOT Permit & Motor Carrier Division MANUAL (1/13/2026 · permits.mdot.ms.gov · in effect since 2024-01-01 · source read 2026-07-12. Fees and rules change; the linked document is always the authority.