Iowa Oversize / Overweight Permit Requirements
Legal-without-permit dimension limits, escort and pilot car thresholds, height pole rules, daylight-only windows, and holiday restrictions for Iowa oversize moves.
Legal limits without a permit
In Iowa, 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 Iowa. Thresholds are conservative — your specific permit conditions may impose tighter limits depending on the route.
| Trigger | Dimension | Threshold | Detail |
|---|---|---|---|
| Rear pilot car | Length | 120'0" | Rear pilot car required for combinations over 120' overall length. |
| Rear pilot car | Width | 14'6" | Rear pilot car required on 4-lane/interstate roads for widths over 14'6" (r. 761-520). |
| Height pole | Height | 14'4" | Height-pole escort required for heights 14'4" to 20'; loads over 20' may be prohibited. |
| Front pilot car | Width | 12'0" | Front pilot car required on 2-lane highways for widths 12'–14'6"; front + rear above 14'6". |
| Daylight-only movement | Width | 11'0" | Sunrise-to-sunset travel only when width exceeds 11', length exceeds 100', or height exceeds 14'6". |
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.