---
title: South Dakota Oversize & Overweight Permits (OS/OW) | SDDOT Superload | Alpine Truck Service
description: Expedited South Dakota SDDOT oversize permits, I-90/I-29 clearances, Sioux Falls curfews, and SDHP escorts. 24/7 commercial dispatch desk. Call (918) 607-6547.
image: https://www.alpinetruckservice.com/alpine-third-party-charges.webp
---

# South Dakota Oversize, Overweight & Superload Permitting Services

Comprehensive commercial trucking permits and heavy haul compliance across South Dakota.

## Agency & Permitting Authority
- **Agency**: South Dakota Department of Transportation (SDDOT) / SDHP
- **Portal**: SDDOT / Highway Patrol Port of Entry E-Permits System
- **Regulatory Advisory**: State DOT regulations and permit processing queues are determined by individual state transportation authorities and vary by agency workload. Carriers should verify active route advisories and state requirements prior to movement.

## Legal vs. Routine Permitted Dimensions
- **Legal Width**: 8' 6" | **Max Routine**: 18' 0"
- **Legal Height**: 14' 0" | **Max Routine**: 16' 0"
- **Legal Length**: 53' Semi-Trailer / 75' Overall | **Max Routine**: 120' 0"
- **Legal Gross Weight**: 80,000 lbs (up to 129,000 lbs on designated state network with Bridge Formula B axle counts) | **Max Routine**: 150,000 lbs
- **Axle Limits**: Single: 20,000 lbs, Tandem: 34,000 lbs, Tridem: 42,000 lbs

## Permitting Scope & Services in South Dakota
- **Routine Oversize (OS) Cab-Cards**: Single-trip authorizations for dimensions exceeding 8' 6" width or 14' 0" height.
- **Overweight (OW) Axle Permits**: Overload cab-cards for heavy machinery and configurations exceeding 80,000 lbs GVW.
- **Multi-Axle Superload Permits**: Specialized filings exceeding Over 150,000, including State DOT and certified partner bridge reviews, route surveys, and police escorts.
- **Annual & Blanket Fleet Permits**: Continuous-operation annual highway authorizations for construction fleets.
- **Temporary Trip & Fuel Permits**: 72-hour IRP vehicle registration and IFTA fuel tax credentials.
- **County, City & Toll Road Clearances**: Municipal authorizations and turnpike clearances.

## Superload Permitting & State Review Protocol
- **Weight Trigger**: Over 150,000 lbs GVW or exceeding standard South Dakota Bridge Formula limits
- **Width Trigger**: Over 18' 0" wide
- **Height Trigger**: Over 16' 0" high
- **Length Trigger**: Over 120' 0" overall length
- **State & Partner Bridge Review**: South Dakota Department of Transportation (SDDOT) / SDHP electronic systems and certified structural engineering partners evaluate axle load distribution across bridge structures upon submission.
- **Route Surveys & Clearances**: Required for extreme heights/widths to verify overhead physical clearances.
- **Utility & Escorts**: Coordinated wire lifts with power utilities and State Police / Highway Patrol escorts.

## Pilot Cars & Escort Vehicle Requirements
- **Front Escort**: Required over 14' 0" wide on two-lane highways; over 16' 0" wide on multi-lane highways
- **Rear Escort**: Required over 16' 0" wide on multi-lane highways; length exceeding 110' 0"
- **Height Pole**: Required over 15' 6" high (front escort with calibrated height pole)
- **Police Escort**: South Dakota Highway Patrol (SDHP) escort required over 18' 0" wide, 18' 0" high, or over 150,000 lbs

## Metro Curfews & Travel Restrictions
- **Curfew Zones**:
  - Sioux Falls Metro (I-29, I-90, I-229): 7:00–8:30 AM & 4:30–6:00 PM M-F (loads >12' wide)
  - Rapid City (I-90, US-16) during peak morning and afternoon commuter hours
- **Travel Rules**: Daylight only (1/2 hour before sunrise to 1/2 hour after sunset), 7 days a week for routine oversize loads. Overweight-only continuous travel allowed with lighting.

## Key Freight Corridors
- I-90 (Cross-Country Logistics Arterial)
- I-29 (Midwest to Canada Spine)
- US-14
- US-12
- US-83 (North-South Great Plains Spine)
- US-212

## Frequently Asked Questions
### What is South Dakota's legal height limit?
South Dakota allows 14'0" legal height on state and interstate highways without requiring an oversize permit.

### What are South Dakota pilot car escort rules?
South Dakota requires 1 escort for loads over 14' wide on 2-lane roads and over 16' wide on multi-lane highways. Loads over 18' wide require Highway Patrol escorts.

### Can oversize loads travel on weekends in South Dakota?
Yes, routine oversize loads up to 16' wide and 16' high may travel 7 days a week during daylight hours.

### How fast can Alpine obtain a South Dakota SDDOT permit?
Routine single-trip permits are processed in 2–4 business hours through the state's electronic port-of-entry system. Alpine expedites filings immediately.

## Contact & Direct Dispatch
- **Direct Phone**: (918) 607-6547 (CALL: [918-607-6547](tel:9186076547))
- **Email**: [permits@alpinetruck.com](mailto:permits@alpinetruck.com)
- **Online Intake**: [alpinetruckservice.com/permits/south-dakota](https://www.alpinetruckservice.com/permits/south-dakota)