Interstate 90 and Interstate 29 are two of the most heavily traveled corridors in the Sioux Falls area, carrying thousands of vehicles every day through the heart of South Dakota. For motorcycle riders, these highways present a unique set of dangers that other motorists simply do not face. The combination of high speeds, heavy truck traffic, unpredictable weather, and driver inattention makes these interstates among the most hazardous stretches of road for riders in the region. Understanding the most common causes of motorcycle accidents on I-90 and I-29 in Sioux Falls is a critical first step toward protecting yourself — and knowing your legal rights if the worst happens.

According to data that tracks serious injury collisions across South Dakota, motorcyclists are disproportionately represented in fatal and catastrophic injury crashes compared to occupants of passenger vehicles. If you ride regularly on either of these interstates, you should be aware of the specific risk factors that contribute to accidents in this area. You can also review Sioux Falls motorcycle accident statistics to understand just how significant these risks are for local riders.

At Northern Plains Justice, LLP, we represent injured victims throughout Sioux Falls and the surrounding region who have been seriously hurt in motorcycle crashes caused by the negligence of others. This article explains the most common causes of these accidents on I-90 and I-29 so that riders, their families, and anyone impacted by a crash can make informed decisions about their legal options.

Why I-90 and I-29 Are Particularly Dangerous for Motorcyclists

Both interstates converge near the center of Sioux Falls, creating a high-traffic interchange where merging lanes, construction zones, and rapidly changing traffic patterns increase the likelihood of collisions. I-90 runs east to west through South Dakota, while I-29 runs north to south, and the junction of these two major routes creates conditions that demand constant vigilance from every road user — especially motorcyclists who have far less physical protection than drivers of enclosed vehicles.

The dangers are not limited to the interchange. Long stretches of I-90 and I-29 outside the city carry significant commercial truck traffic, and the open plains environment means that high winds, icy conditions, and sudden storms can develop quickly and without much warning. For riders, any one of these factors alone can be dangerous — and in combination, they can be deadly.

Common Causes of Motorcycle Accidents on These Interstates

Crashes on I-90 and I-29 in the Sioux Falls area are rarely random. Most accidents trace back to identifiable causes rooted in driver negligence, road conditions, or environmental factors. Understanding these causes can help riders anticipate danger — and helps injured victims understand the basis for a legal claim when another party is at fault.

Driver Inattention and Distracted Driving

Distracted driving is one of the leading causes of motorcycle accidents across South Dakota and nationally. On long stretches of interstate highway, drivers of passenger vehicles and commercial trucks may become complacent, glancing at phones, adjusting navigation systems, or simply losing focus on the road ahead. A motorcycle occupies far less visual space than a car or truck, meaning distracted drivers often fail to notice a rider until it is too late to avoid a collision.

Unsafe Lane Changes and Failure to Yield

On both I-90 and I-29, merging traffic and lane changes create serious hazards for motorcyclists. Drivers who fail to check their blind spots before merging can strike a rider with little or no warning. This is especially dangerous in the areas near exit and entrance ramps around Sioux Falls, where traffic regularly shifts lanes. Injured victims in these situations may have a strong negligence claim against the at-fault driver, particularly when the driver failed to yield. Our firm also handles related cases involving failure to yield accidents in Sioux Falls that share the same legal principles.

Rear-End Collisions at Highway Speeds

When traffic slows unexpectedly on an interstate — due to construction, an earlier accident, or congestion near the I-90 and I-29 interchange — motorcyclists are at extreme risk of being struck from behind. A rear-end collision at highway speeds is catastrophic for a rider. Broken bones, spinal injuries, and traumatic brain injuries are common outcomes. If you or someone you love has suffered these injuries, learning more about broken bone injuries in Sioux Falls motorcycle accidents can help you understand the full scope of compensation available. Our firm also handles rear-end accident claims in Sioux Falls when drivers fail to maintain safe following distances.

Head-On Collisions and Wrong-Way Drivers

Although less common, wrong-way drivers and head-on collisions on South Dakota interstates do occur — and when they involve a motorcycle, the results are nearly always fatal or catastrophic. Impaired drivers, confused motorists entering the wrong ramp, and fatigued drivers drifting across the center line are all known contributors. Our firm handles head-on collision claims in Sioux Falls and understands the devastating toll these crashes take on victims and families.

Road Hazards and Poor Road Conditions

Gravel, debris, uneven pavement, and expansion joints that barely affect a car can send a motorcycle out of control in seconds. Construction zones along I-90 and I-29 frequently introduce road surface changes that create serious hazards. Ice and snow during South Dakota winters make these interstates especially treacherous for riders who extend their season into the shoulder months. In some cases, liability for road hazard accidents may extend beyond another driver to a government entity or contractor responsible for maintaining safe road conditions.

Commercial Truck Traffic and Blind Spots

Semi-trucks and commercial vehicles are a constant presence on both I-90 and I-29, and their large blind spots present an ongoing danger to motorcyclists. Trucks require significantly more stopping distance than passenger vehicles, and a rider caught in a truck’s blind spot may be struck during a lane change or when the truck brakes suddenly. The physics of these crashes make serious injuries almost inevitable for the motorcyclist involved.

What Injured Motorcyclists Should Do After an I-90 or I-29 Crash

The steps you take immediately after a crash on I-90 or I-29 can significantly affect your health and your legal claim. Knowing what to do — and what to avoid — is essential for protecting your right to compensation. A detailed guide on what to do after a motorcycle accident in Sioux Falls walks through the most important actions to take.

• Call 911 immediately and request medical assistance, even if you believe your injuries are minor
• Do not move from the scene unless you are in immediate danger
• Document the crash scene with photos if it is safe to do so
• Collect the names, contact information, and insurance details of all drivers involved
• Speak with witnesses and obtain their contact information
• Avoid making any statements about fault at the scene
• Seek a full medical evaluation as soon as possible — some serious injuries are not immediately apparent
• Contact an experienced motorcycle accident attorney before speaking with any insurance company

How Fault Is Determined in Interstate Motorcycle Crashes

Establishing liability after a crash on I-90 or I-29 requires a thorough investigation of the evidence. This includes police reports, traffic camera footage, witness statements, electronic data from commercial vehicles, and accident reconstruction analysis. Understanding how fault is determined after a motorcycle accident in Sioux Falls is important because South Dakota follows a modified comparative negligence rule — meaning that any finding of fault against you can reduce your compensation.

Insurance companies routinely attempt to shift blame onto the motorcyclist to reduce or eliminate their payout. Understanding how insurance companies handle motorcycle accident claims in Sioux Falls — and more broadly, how insurers approach all motor vehicle claims — makes clear why having legal representation from the very beginning of your claim matters enormously.

Your Legal Rights After a Motorcycle Accident on I-90 or I-29

Injured victims who have been hurt through someone else’s negligence on these interstates have the right to pursue compensation for their medical expenses, lost wages, pain and suffering, and long-term rehabilitation costs. It is important to understand your full legal rights after a motorcycle accident in Sioux Falls before accepting any settlement offer from an insurance company. When a crash results in a fatality, surviving family members may have a wrongful death claim — and the attorneys at Northern Plains Justice, LLP are experienced wrongful death motorcycle accident lawyers in Sioux Falls who can guide families through that process with compassion and skill.

Riders should also be aware that accidents are not limited to the interstate corridors. Our firm’s resource on the most dangerous intersections for motorcyclists in Sioux Falls highlights additional risk areas throughout the city that every rider should know.