South Dakota Speed Limits, Fines, and License Points

South Dakota speed limit laws, fines, and penalties set a 65 mph default on highways, with posted limits running from 15 mph in school zones up to 80 mph on rural interstates. Every speeding offense is a Class 2 misdemeanor, and the total cost of a ticket starts at $97.50 for 1 to 5 mph over and climbs from there. Fines double in construction zones when workers are present, and enough tickets in a short window will cost you your license.¹

Speed Limits by Road Type

State law sets 65 mph as the baseline maximum on any street or highway unless a different limit is posted.² That default covers most two-lane state highways and secondary routes. Two posted exceptions push the number higher: rural interstate segments at 80 mph, and four-lane divided highways commonly posted at 70 mph where the Transportation Commission has approved it.

In urban areas with no posted speed signs, the ceiling drops to 25 mph, covering residential neighborhoods and business districts without other signage.³ Township roads carry a default of 55 mph, and local township boards can set lower posted zones on roads they control.⁴

Reasonable and Prudent Speeds

Being under the posted number is not a defense when conditions call for less. South Dakota requires drivers to travel at a speed that is reasonable for current conditions, and ignoring fog, ice, rain, construction, or heavy traffic is itself a Class 2 misdemeanor.⁵ An officer can cite you for driving 55 in a 65 zone during a blizzard. The sign is the ceiling, not a guaranteed safe speed.

School Zones and Work Zones

When passing a school during opening and closing hours while children are arriving, leaving, or at recess, the limit drops to 15 mph.⁶ School zone fines run higher than the standard schedule: just 1 to 5 mph over costs $112.50, versus $97.50 on a regular highway.¹

Highway work zones take effect as soon as reduced-speed signs are posted at the zone’s entrance.⁷ When workers are present, the fine doubles. Going 6 to 10 mph over in a work zone costs $156.50 total, compared to $117.50 on a regular highway. At 26 or more mph over, the total reaches $386.50. The doubled fine is capped at the Class 2 misdemeanor maximum of $500.

What a Speeding Ticket Actually Costs

The number printed as the “fine” is only part of what you pay. Mandatory court costs and surcharges add roughly $78.50 to every ticket, funding court automation, law enforcement training, and other statutory programs. Under the FY2026 schedule in effect since July 1, 2025, speeding on a regular highway or interstate costs:¹

1–5 mph over: $19 fine, $97.50 total
6–10 mph over: $39 fine, $117.50 total
11–15 mph over: $59 fine, $137.50 total
16–20 mph over: $79 fine, $157.50 total
21–25 mph over: $99 fine, $177.50 total
26+ mph over: $154 fine, $232.50 total

Every speeding offense is classified as a Class 2 misdemeanor, carrying a theoretical maximum of 30 days in county jail, a $500 fine, or both.⁸ First-time speeders pay the schedule amount rather than face jail, but the classification matters: this is a criminal offense, not a civil infraction.

Points, Suspension, and Insurance

South Dakota tracks moving violations through a point system.⁹ Accumulating 15 points within 12 consecutive months, or 22 points within 24 consecutive months, triggers a mandatory license suspension.¹⁰ Points also show up on the driving record insurers pull, which is where most drivers feel the real financial pain long after the ticket is paid.

Commercial Drivers Face Stricter Thresholds

For CDL holders, speeding 15 mph or more over the posted limit counts as a “serious traffic violation.”¹¹ Two serious violations within three years means a 60-day CDL disqualification. A third within three years means 120 days. For a professional driver, a single ticket at the wrong speed can put the job at risk.

When Speeding Becomes Reckless Driving

There’s no fixed mph threshold that automatically upgrades a speeding ticket to reckless driving. The reckless statute covers operating a vehicle with disregard for the safety of others, at a speed or in a manner likely to endanger people or property.¹² Context drives the call. Going 90 on an empty rural interstate is not the same as going 90 through a residential neighborhood.

Reckless driving is a Class 1 misdemeanor, punishable by up to one year in jail and a $2,000 fine.⁸ That’s a sharp jump from the Class 2 classification of a standard speeding offense.

Move-Over Law

When approaching a stopped emergency vehicle, road service vehicle, or any vehicle on the shoulder displaying flashing amber or yellow lights, you must either move to a farther lane or slow to at least 20 mph below the posted limit. Failing to do so is a Class 2 misdemeanor. If the failure causes an accident with property damage or injury, the charge escalates to a Class 1 misdemeanor carrying up to a year in jail and a $2,000 fine. An accident causing serious injury or death can also bring a license suspension of up to one year.¹³

Going Too Slow Is Also a Violation

The interstate has a floor of 40 mph. Driving below that is a Class 2 misdemeanor, with exceptions only for vehicles under a permit from the Department of Public Safety or highway maintenance equipment.¹⁴ On other roads, a separate statute prohibits driving so slowly that you impede normal traffic flow, unless the reduced speed is necessary for safety or required by law.¹⁵

Responding to the Ticket

You generally have about 15 days from the date of the ticket to enter a plea. To contest the citation, check the “not guilty” box on the ticket and mail it to the relevant county court to request a hearing. Missing the deadline to respond can trigger additional penalties, including a potential license suspension. If you plan to fight it, responding on time is not optional.

If You’re Licensed in Another State

South Dakota is a member of the Driver License Compact, so a conviction here gets reported to your home state if that state is also a member. Your home state then applies its own laws to the offense, which can mean points on your record there, higher insurance premiums, or a suspension if you’ve already accumulated violations. A ticket does not stay in South Dakota just because you don’t live here.

1
South Dakota Unified Judicial System. FY26 Fine and Bond Schedule
2
South Dakota Legislature. South Dakota Code 32-25-1.1 – Maximum Daytime Speed Violation as Misdemeanor
3
South Dakota Legislature. South Dakota Code 32-25-12 – Speed Limit in Unposted Urban Areas Violation as Misdemeanor
4
South Dakota Legislature. South Dakota Code 32-25-9.2 – Township Road Speed Limit
5
South Dakota Legislature. South Dakota Code 32-25-3 – Requirement That Speed Be Reasonable and Lawful Under Statutes Violation as Misdemeanor
6
South Dakota Legislature. South Dakota Code 32-25-14 – Speed Limit in School Zones Violation as Misdemeanor
7
South Dakota Legislature. South Dakota Code 32-25-19.1 – Limited Speed Zones Signs Posted Violation as Misdemeanor
8
South Dakota Legislature. South Dakota Code 22-6 – Classification of Misdemeanors Penalties
9
South Dakota Legislature. South Dakota Code 32-12-49.1 – Point System for Offenses Number of Points Charged
10
South Dakota Department of Public Safety. South Dakota Point System
11
South Dakota Truck Information. CDL Disqualification or Cancellation
12
South Dakota Legislature. South Dakota Code 32-24-1 – Reckless Driving
13
South Dakota Legislature. South Dakota Code 32-31-6.2 – Emergency Vehicles
14
South Dakota Legislature. South Dakota Code 32-25-5 – Minimum Speed on Interstate Highways Violation Exceptions
15
South Dakota Legislature. South Dakota Code 32-25-5.1 – Unreasonably Slow Speed Prohibited Violation as Misdemeanor