Wyoming Oversize / Overweight Permit Requirements
Legal-without-permit dimension limits, escort and pilot car thresholds, height pole rules, daylight-only windows, and holiday restrictions for Wyoming oversize moves.
Legal limits without a permit
In Wyoming, 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 Wyoming. Thresholds are conservative — your specific permit conditions may impose tighter limits depending on the route.
| Trigger | Dimension | Threshold | Detail |
|---|---|---|---|
| Front pilot car | Length | 100'0" | Front pilot required for overall lengths over 100' on 2-lane and undivided highways (WYDOT Ch. 5 §6). |
| Police escort | Width | 20'0" | Wyoming Highway Patrol escort required for loads exceeding 20' wide or per permit conditions (Wyo. Stat. §31-18-301). |
| Rear pilot car | Width | 16'0" | Second (rear) pilot car required when width exceeds 16'. Lead+chase both required on all route types (WYDOT Ch. 5 §6). |
| Height pole | Height | 15'0" | Lead pilot car must carry a height-clearance pole for loads taller than 15' (WYDOT Ch. 5 §6). |
| Front pilot car | Width | 14'0" | Front pilot car required for widths over 14' on all state highways. One escort on 2-lane (WYDOT Ch. 5 §6). |
| Certified escort required | Width | 14'0" | Wyoming requires WYDOT-certified escort vehicle operators for all oversize permitted moves on state highways (WYDOT Ch. 5 §6). |
| Daylight-only movement | Width | 14'0" | Loads over 14' wide restricted to daylight hours (sunrise to sunset). Night travel requires special permit endorsement (WYDOT Ch. 5 §6). |
| Weekend / holiday restriction | Width | 14'0" | No oversize movement on New Year's, Memorial Day, Independence Day, Labor Day, Thanksgiving, Christmas. Window begins noon of preceding day for loads over 14' wide (WYDOT Ch. 5 §6). |
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.