Missouri Oversize / Overweight Permit Requirements
Legal-without-permit dimension limits, escort and pilot car thresholds, height pole rules, daylight-only windows, and holiday restrictions for Missouri oversize moves.
Legal limits without a permit
In Missouri, you can move a load without an OSOW permit up to these dimensions on the Interstate and designated highways. Anything over the limits requires a permit (and may require escorts — see below).
| Dimension | Without a permit | Permit required when |
|---|---|---|
| Width | 8′6″ (federal limit) | Anything wider |
| Height | 13′6″ | Anything taller |
| Combo length | 75′0″ | Anything longer |
| Gross weight | 80,000 lb | Anything heavier |
Escort and pilot car thresholds
When permitted, the following escort or movement-restriction rules apply in Missouri. Thresholds are conservative — your specific permit conditions may impose tighter limits depending on the route.
| Trigger | Dimension | Threshold | Detail |
|---|---|---|---|
| Police escort | Length | 150'0" | MO State Highway Patrol escort required when overall length exceeds 150'. |
| Rear pilot car | Length | 110'0" | Rear civilian escort required for combinations over 110' overall length. |
| Police escort | Width | 18'0" | MO State Highway Patrol escort required on divided highways for widths over 18' (25.020(9)). |
| Police escort | Height | 17'0" | MO State Highway Patrol escort required when height exceeds 17'. |
| Police escort | Width | 16'0" | MO State Highway Patrol escort required on 2-lane undivided highways for widths over 16'. |
| Height pole | Height | 15'6" | Height-pole vehicle required when load exceeds 15'6" in height. |
| Front pilot car | Width | 14'0" | Front + rear civilian escorts required on all road types when width exceeds 14' (25.020(9)). |
| Front pilot car | Width | 12'6" | 1 front civilian escort required on 2-lane roads for widths 12'6"–14'. |
| Rear pilot car | Width | 12'6" | 1 rear civilian escort required on divided roads for widths 12'6"–14'. |
| Daylight-only movement | Width | 12'6" | Sunrise-to-sunset travel only when width exceeds 12'6"; no Sunday travel statewide. |
| Weekend / holiday restriction | Width | 12'6" | No Sunday travel. No holiday travel on New Year's, Memorial Day, July 4, Labor Day, Thanksgiving, Christmas. |
Stop tracking these rules by hand.
OverSizeTMS encodes the per-state escort and dimension rules for every state plus DC. Enter the load dimensions and route, and the platform tells you which permits, escorts, and time windows apply automatically.
See how it works →Last updated 2026-06-06. Cross-checked against the state admin code.