I've been looking at South Dakota roadside inspection data from the past 37 months, and what I see is a state running tighter than the national average—not in the way you might think. The numbers tell me SD isn't catching fewer violations; it's hitting harder on the ones that matter.
Between August 2023 and August 2026, South Dakota recorded 86,727 roadside inspections. That's a solid dataset. But here's what stood out immediately: the out-of-service rate. At 21.5%, it's sitting 3.9 percentage points above the national average of 17.6%. That means nearly one in every five vehicles that went through a roadside inspection didn't leave without an order pulling it from service.
Before you assume that's a fleet problem unique to SD, let me be clear: these numbers show what inspectors are actually finding, not a referendum on operator quality. It reflects enforcement consistency and what the inspection process reveals.
Check the detailed breakdown on VioCodes' state insights for South Dakota
The Numbers at a Glance
Out of 86,727 inspections, 69,753 violations were cited. That's 0.8 violations per inspection—actually a moderate rate. But here's the key metric: 14,996 of those inspections resulted in an out-of-service order. That 21.5% OOS rate is what you need to understand.
The breakdown matters:
- Vehicle violations: 14,673 total, 10,914 OOS (74% conversion to out-of-service)
- Driver violations: 9,409 total, 4,082 OOS (43% conversion)
- Hazmat violations: 93 total, 11 OOS
Vehicle-side failures are driving this number. Lights, brakes, tires, coupling devices, cargo securement—these show up consistently as out-of-service failures because they're objective. An inspector doesn't interpret whether a brake pad meets minimum thickness. They measure it. They test the lights. The vehicle criteria in 49 CFR Part 396 are binary: the vehicle either meets the standard or it doesn't.
Why the OOS Rate Runs High
A 21.5% OOS rate doesn't happen by accident. It reflects consistent application of the out-of-service criteria. At 17.3 out-of-service determinations per 100 inspections, South Dakota is running materially above the national average.
When I worked through fleets, this number meant one of two things: either maintenance standards in the region were slipping, or inspectors weren't giving quarter to defects that created real hazards. Based on what I'm seeing in the vehicle violation data—which makes up 74% of the violations cited—I'd say it's the latter. These are legitimate safety failures, not borderline calls.
Driver-side violations convert to OOS at only 43%, which tells me those are more often citations and fines. Licensing issues, log violations, hours-of-service discrepancies—they get addressed through enforcement action, not immediate removal from service. Vehicle issues shut you down until they're fixed.
What This Means for Fleet Operations
If you run trucks in or through South Dakota, treat this data as the baseline expectation. The enforcement posture is real. Here's what the numbers tell you to do:
Maintenance discipline: The vehicle violation data shows exactly what gets pulled. Brake systems, lighting, tires, coupling integrity, cargo securement. These aren't theoretical risks—they're the highest-consequence failures in SD. Put them on a preventive maintenance calendar. Don't wait for an inspection to find them.
Pre-trip is not optional: Your drivers need to perform the same checks an inspector performs. Spot a defect during pre-trip? You fix it before you roll. You don't discover it during a roadside inspection.
Understand the regulations: The out-of-service criteria are published in 49 CFR Part 396. Read them. Know which defects are immediate out-of-service (brakes below specification, for example) and which generate citations. Train your drivers and maintenance teams to this standard.
Plan for consequences: With a 21.5% OOS rate, assume a portion of your fleet will encounter inspection issues. Budget for downtime. Budget for repairs that can't wait. Budget for the cost of running a compliant operation.
Using This Data
The inspection data from South Dakota covers 37 months—a real sample, not a projection. These are actual roadside inspection records. You can use them to predict what your fleet will encounter, and more importantly, what your maintenance and inspection gaps actually are.
If you're building your compliance strategy for SD operations, start here. The numbers show what gets found, what gets cited, and what gets pulled. That's the enforcement reality. Your preventive program should be built to exceed that standard, not meet it.
Dig deeper into the state-level breakdowns here. Filter by violation type, look at the severity codes, and map the data to your fleet profile. You can see which defect categories represent your actual risk, not just the statistical average.
If you want to explore how South Dakota compares to other regions, use the inspection map to see OOS rates and violation patterns across all states. That context helps you understand whether your fleet's inspection experience in SD is typical or outlier.
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Key Takeaways
- South Dakota's 21.5% OOS rate is 3.9 points above the national 17.6% average
- Vehicle violations account for 14,673 of 69,753 total violations (74% OOS conversion rate)
- The 0.8 violations-per-inspection rate is moderate; what's high is the consequence—out-of-service orders
- Driver violations convert to OOS at 43%; vehicle defects at 74%—meaning vehicle maintenance is the enforcement priority
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That's the story the data tells. If you want to see where your specific operation stands against these benchmarks, VioCodes' violation search lets you pull this data by fleet, by violation type, by region, and by timeframe. You can see what you're actually encountering on the road versus what the state averages show. That gap—that's where your improvement opportunity lives.