In South Dakota, any load that exceeds the legal size or weight limits requires an oversize/overweight permit before it moves. Below are the legal limits and the requirements that apply at each threshold.
1When you need a permit
A load is oversize or overweight once it passes any of these:
| Dimension | South Dakota legal limit | Permit if over |
|---|---|---|
| Width | 8 ft 6 in | Wider |
| Height | 14 ft | Taller |
| Length (combination) | 75 ft | Longer |
| Gross weight | 80,000 lbs | Heavier |
| Single axle | 20,000 lbs | Heavier |
| Tandem axle | 34,000 lbs | Heavier |
Rear overhang is limited to 4 ft without an over-length permit.
2Escort & pilot car requirements
| Once the load is over… | South Dakota requires |
|---|---|
| 16 ft wide | 1 escort (pilot car) |
3When you can travel
- Daylight only — 30 min before sunrise to 30 min after sunset.
- Weekend travel allowed within dimensional limits.
- Anytime movement up to 10 ft wide, 14 ft 6 in high and 110 ft long (combination; 45 ft single unit) if no escort is required, the load can hold posted speed, and it runs on an Interstate or within 2 miles of an interchange..
5Permit timing
- Standard single-trip: ~2 business days to issue.
Get the full cost of your load
FreightDeck estimates every cost on an oversize move — permits, escorts, police, route survey, engineering, and the truck rate — for your exact load and route, across all 48 states and Canada, up to superload size.
Price your South Dakota load free →The most complete heavy-haul cost estimator · 48 states + Canada · no card to start · See plans & pricing
?South Dakota permit FAQ
When do I need an oversize permit in South Dakota?
Once a load exceeds any legal limit: 8 ft 6 in wide, 14 ft high, 75 ft long (combination), or 80,000 lbs gross.
When do I need a pilot car in South Dakota?
South Dakota requires one escort over 16 ft wide.
Can you drive an oversize load at night in South Dakota?
Daylight only, 30 min before sunrise to 30 min after sunset. Anytime movement up to 10 ft wide, 14 ft 6 in high and 110 ft long (combination; 45 ft single unit) if no escort is required, the load can hold posted speed, and it runs on an Interstate or within 2 miles of an interchange. Weekend travel is allowed within limits.
How much does a South Dakota oversize permit cost?
The state permit fee depends on the load's size and weight. The full cost of a move also includes escorts, police, route surveys, engineering, and the truck rate, which vary by route. FreightDeck estimates all of it for your exact load — price your South Dakota load with FreightDeck →.
How long does it take to get an oversize permit in South Dakota?
Routine single-trip permits usually issue in about 2 business days.
How much overhang is allowed in South Dakota?
Rear overhang is limited to 4 ft without an over-length permit.
Does South Dakota have spring thaw weight restrictions?
Yes. Seasonal axle weight limits apply roughly February through April. Overweight permits on posted roads are limited or unavailable during the window, so schedule heavy deliveries around it. Spring thaw rules by state →
Are any loads exempt from oversize permits in South Dakota?
South Dakota publishes exemptions or relaxed rules for farm equipment (for example no over-width movement on the state trunk system from 1/2 hr after sunset to 1/2 hr before sunrise (32-22-2). on other roads, night movement allowed with flashing/rotating white or amber lights at each widest side (32-22-3.2). dealer/manufacturer transport is not exempt). Exemptions are narrow and usually limited to specific roads and daylight hours; anything else over the legal limits needs a permit.
Does a South Dakota permit cover North Dakota?
No. Every state issues its own permit, and a move crossing into North Dakota, Minnesota, or Iowa needs a separate permit there with that state's escort and travel rules. FreightDeck prices every state on the route in one quote.