The 7 CSA BASIC Categories Explained: Violations, Weights, and Management Strategies

Seven categories. Each scored independently. Crossing an FMCSA intervention threshold in any one BASIC can increase scrutiny from FMCSA and may trigger interventions — even if the other six are clean.

Every violation code carries a severity weight from 1 (minor) to 10 (critical), then gets time-multiplied: 3x for the most recent six months, 2x for months 7–12, 1x for months 13–24. Every violation code carries a severity weight from 1 (minor) to 10 (critical), then gets time-multiplied: 3x for the most recent six months, 2x for months 7–12, 1x for months 13–24. Most violations stop affecting SMS calculations after 24 months, though crash data and certain records may follow different retention timelines. For the full retention breakdown, see How Long Does a CSA Violation Stay on Record? That math is the same across all seven BASICs. For the full retention breakdown, see How Long Does a CSA Violation Stay on Record?

1. Unsafe Driving

Threshold: 65th percentile (50th for passenger carriers)

One of the most closely watched BASICs. It has one of the lowest intervention thresholds outside Crash Indicator and is heavily scrutinized by insurers and enforcement agencies because of its connection to crash risk. Lowest threshold of the non-Crash categories, highest correlation with future crash risk, and the one insurance underwriters look at first.

Two violation types dominate: speed and distraction. Speeding and distraction violations tend to drive Unsafe Driving scores more than almost anything else. Targeted coaching, consistent policy enforcement, and tools like forward-facing cameras can help reduce repeat violations more effectively than occasional safety refreshers alone. Forward-facing cameras and weekly coaching sessions on repeat offenders are the practical tools — not a quarterly safety meeting.

2. Hours-of-Service Compliance

Threshold: 65th percentile (50th for passenger carriers)

Many HOS violations stem from unrealistic scheduling, detention delays, or operational pressure — not just intentional driver misconduct. Dispatch planning, load timing, and communication all play a role in preventing violations before a driver reaches the end of available hours. They're dispatch scheduling loads that don't account for realistic drive times, forcing drivers into impossible situations at the tail end of a shift. Fix the scheduling. That's where the violations come from.

“HOS violations are often the result of poor dispatch planning, not deliberate driver misconduct. When fleet managers monitor available hours proactively and adjust loads before violations happen, this BASIC drops quickly.”

3. Driver Fitness

Threshold: 80th percentile (60th for passenger carriers)

A disqualified driver operating a CMV. That's a severity-10 violation and it can push this entire BASIC above threshold by itself. The problem is that CDLs, medical certificates, and endorsements all expire on different schedules — and none of them send you a reminder.

Automated tracking isn't a luxury here. A safety director manually watching 40 expiration dates across different license classes and medical cycle lengths is going to miss something. It's not a question of diligence. It's math.

4. Controlled Substances / Alcohol

Threshold: 80th percentile (60th for passenger carriers)

Roadside drug and alcohol violations are rare compared to brake defects or HOS issues. But when they show up, the severity weights are 8s and 10s, and one violation can push a small carrier above threshold overnight.

Keeping this BASIC clean means a fully compliant DOT drug and alcohol testing program — pre-employment, random, post-accident, reasonable suspicion, return-to-duty, and follow-up. Certain DOT drug and alcohol program violations and return-to-duty events must be reported to the FMCSA Drug & Alcohol Clearinghouse under federal requirements.

5. Vehicle Maintenance

Threshold: 80th percentile (50th for passenger carriers)

More violations land here than in any other BASIC. Level 1 inspections are thorough — brake, tire, and lighting defects show up constantly. Carriers who manage this BASIC are running pre-trip inspections that actually catch problems, not 90-second checkbox exercises where every field gets marked clean before the driver's walked halfway around the truck.

One brake OOS violation carries more BASIC points than twenty bad lamps. Prioritize accordingly.

6. Hazardous Materials Compliance

Threshold: 80th percentile (all carrier types)

Applies only if you're moving hazmat. Narrower violation list than the other BASICs, but the stakes are higher. A leaking container is a severity-10 citation.

If you're not moving hazmat, skip this BASIC. FMCSA doesn't score it for non-hazmat operations.

7. Crash Indicator

Threshold: 65th percentile (general freight and passenger) · 60th percentile (hazmat)

This one's different. It's not based on inspection violations — it's based on DOT-reportable crash data (fatality, injury requiring off-scene medical treatment, or a towed vehicle). Crash Indicator scores are based on DOT-reportable crash data, regardless of whether the carrier was cited or formally determined at fault at the scene. Your driver gets rear-ended by a distracted car driver, everyone walks away except the car, the car gets towed — that goes on your Crash Indicator record.

Carriers find this the most frustrating part of the entire SMS system, and honestly that frustration is legitimate.

Since you can't avoid fault-independent reporting, your strategy is prevention plus documentation. Forward-facing cameras are essential. If your driver wasn't at fault, submit a Crash Preventability Determination through FMCSA's DataQs system. Approved requests may receive a “Not Preventable” designation through FMCSA’s Crash Preventability Determination Program, which can affect how the crash appears in SMS calculations and public display.

The Common Mistake

Carriers react to whichever BASIC crossed the threshold last month and ignore everything trending upward. That's firefighting. A BASIC moving from 55th to 62nd over three consecutive months needs attention before it crosses the line — not after.

Watch all seven, monthly. Address above-threshold immediately. But also watch trajectory.

Unsafe Driving and Crash Indicator carry the lowest thresholds. Start there. Run DataQs reviews across all BASICs — inaccurate violations inflate your scores and get removed when you challenge them.

For the complete improvement playbook, see How to Improve Your CSA Score.