Truck Accident Laws in South Dakota (2026): Deadlines & Liability

A crash with a large commercial truck in South Dakota is governed by two layers of law at once: South Dakota's own rules on deadlines, fault, and insurance, and a thick set of federal safety regulations that apply to interstate trucking companies and their drivers. Together they shape who can be held responsible and how long you have to act. South Dakota's fault rule is unlike any other state's, so understanding it matters. This page explains both, as general legal information rather than legal advice.

The deadline to sue in South Dakota

South Dakota's statute of limitations for personal injury is three years from the date the cause of action accrued under SDCL 15-2-14. A wrongful-death action arising from a fatal truck crash must be commenced within three years after the death under SDCL 21-5-3, with that clock running from the date of death rather than the date of the underlying injury. The distinction can matter when an injured person survives for a time before dying from the crash.

A few situations change the deadline. The period can be tolled for an injured minor or a person under a legal disability. If a public entity is a defendant, separate notice requirements can apply and the time to act may be shorter, so those claims demand fast action. Because exceptions are narrow and courts enforce the deadline strictly, the safest course is to treat three years as a hard limit and act well before it.

How fault works: South Dakota's slight/gross rule

South Dakota does not use the comparative-negligence systems found in most states. Under SDCL 20-9-2, a plaintiff's contributory negligence does not bar recovery only when that negligence was 'slight in comparison with the negligence of the defendant.' If your own fault was more than slight, you recover nothing. When recovery is allowed, your damages are reduced in proportion to your share of fault. This is the only fault rule of its kind in the country, and whether a plaintiff's negligence is 'slight' is judged against the defendant's negligence, not against the conduct of an ordinarily prudent person.

South Dakota courts have given the rule shape. In Wood v. City of Crooks (1997), the South Dakota Supreme Court held that a plaintiff who was found 30% at fault was, as a matter of law, more than slightly negligent and therefore barred from recovery. The legislature responded the next year: a 1998 amendment (SL 1998, ch 125) added a second paragraph to SDCL 20-9-2 providing that, notwithstanding that decision, the slight/gross determination shall be made without disclosing any determination of the percentage of the plaintiff's fault by special interrogatory. The percentage mechanism the holding operated on is therefore no longer put to the jury in that form, so a South Dakota jury generally will not return a numeric fault percentage for the plaintiff. Because the line between 'slight' and 'more than slight' is fact-intensive and consequential, the fault analysis is often the central battleground in a South Dakota injury case.

No-fault status: South Dakota is an at-fault state

South Dakota is not a no-fault state. It does not require personal injury protection (PIP) coverage, and there is no statutory injury threshold you must cross before you can sue. Instead, the driver and company at fault for the crash are directly responsible for the resulting harm, and you pursue them (and their insurers) for medical bills, lost income, pain and suffering, and other losses. This is a meaningful difference from no-fault states, where an injured person first turns to their own PIP coverage and must clear a threshold before stepping outside the no-fault system.

Damage caps in South Dakota

South Dakota places no general statutory cap on compensatory damages in an ordinary personal-injury or wrongful-death case, so economic losses such as medical bills and lost income and noneconomic losses such as pain and suffering are not statutorily limited. A notable exception exists for medical-malpractice claims, where SDCL 21-3-11 caps general (noneconomic) damages, but that cap does not apply to an ordinary truck-crash claim. Punitive damages may be available where the conduct was willful, wanton, or malicious, subject to South Dakota's procedural requirements.

Insurance context in South Dakota

South Dakota requires every driver to carry minimum auto liability coverage of $25,000 per person and $50,000 per accident for bodily injury, plus $25,000 for property damage, under SDCL 32-35-70, along with uninsured-motorist coverage. Those minimums are modest, but a commercial truck operating in interstate commerce is subject to the much higher federal financial-responsibility rules discussed below, which is one reason trucking cases differ from ordinary car crashes.

Federal FMCSA rules that apply to trucking companies

Most large commercial trucks and the companies that run them are regulated by the Federal Motor Carrier Safety Administration (FMCSA) under Title 49 of the Code of Federal Regulations. These rules set the safety baseline, and a violation can be powerful evidence of negligence:

• Hours of service (49 CFR Part 395): a property-carrying driver may drive no more than 11 hours after 10 consecutive hours off duty, cannot drive beyond the 14th hour after coming on duty, must take a 30-minute break after 8 hours of driving, and is capped at 60 hours in 7 days or 70 hours in 8 days.
• Electronic logging devices (49 CFR Part 395): most drivers must record their hours with an ELD, and carriers must retain the data, which can confirm or contradict a fatigue defense.
• Driver qualification and CDL (49 CFR Part 391): carriers must verify a driver's license, medical fitness, and record before putting them on the road.
• Drug and alcohol testing (49 CFR Part 382): carriers must conduct pre-employment, random, and post-accident testing and use the FMCSA Clearinghouse.
• Inspection, repair, and maintenance (49 CFR Part 396): carriers must systematically inspect and maintain their vehicles and keep records.

Who can be liable after a truck crash

A truck case routinely involves more potential defendants than a typical car crash, and many are corporate. Depending on the facts, responsibility may extend to:

• The driver, for negligent driving such as speeding, distraction, or fatigue.
• The motor carrier (trucking company), often vicariously for its driver's on-the-job conduct, and directly for negligent hiring, training, supervision, or retention, or for pressuring drivers past the hours-of-service limits.
• A broker or shipper, in some circumstances.
• A cargo loader, when improper or overweight loading causes or worsens a crash.
• A parts or vehicle manufacturer, when a defective brake, tire, or component contributes.

Identifying every responsible party matters because additional defendants can mean additional insurance coverage and a fuller picture of how the crash happened.

Federal minimum insurance for trucks

Under 49 CFR 387.9, a for-hire motor carrier transporting non-hazardous general freight in interstate commerce must maintain at least $750,000 in liability insurance. Carriers hauling certain hazardous materials must carry far more, up to $5,000,000. That $750,000 baseline, set by the Motor Carrier Act of 1980, dwarfs South Dakota's $25,000 minimum for ordinary drivers and is a major reason truck cases are handled differently from car-accident claims.

Why evidence preservation matters early

Much of the proof in a truck case lives in the truck and the carrier's files: ELD and logbook records, the engine control module (the truck's onboard data recorder or black box), maintenance and inspection logs, dispatch records, and the post-accident drug-and-alcohol test. Some of that data can be overwritten or routinely discarded within months. A timely spoliation or evidence-preservation letter to the carrier, sent early, helps ensure this information is kept rather than lost.

How to evaluate a South Dakota truck-accident claim

If you have been injured, preserve what you can: the police report, photographs of the scene and vehicles, the names of witnesses, and your medical records. Get medical care and keep documentation of your treatment and lost income. Many South Dakota personal-injury attorneys evaluate truck cases on a contingency-fee basis and offer a free initial consultation, meaning no upfront fee, though no lawyer can guarantee a result. Because the three-year deadline is firm, the slight/gross fault rule is demanding, and evidence can disappear, it is wise to consult a licensed South Dakota attorney promptly rather than waiting.