How to Read a CSA Score: A Broker's Guide

What Are CSA Scores?

The Compliance, Safety, Accountability (CSA) program is FMCSA's system for monitoring motor carrier safety. At its core are the Safety Measurement System (SMS) scores, which rank carriers against their peers across seven categories called BASICs.

Each BASIC score is a percentile from 0 to 100. A score of 75 means the carrier performed worse than 75% of its peers in that category. Higher is worse.

The Seven BASICs

1. Unsafe Driving

Measures dangerous driving behaviors observed during inspections: speeding, reckless driving, improper lane changes, texting. This is the BASIC that correlates most strongly with crash risk.

Intervention threshold: 65% for most carriers, 50% for passenger/hazmat carriers.

2. Hours-of-Service (HOS) Compliance

Tracks violations related to driving time limits, required breaks, and logbook accuracy. With ELD mandates, this category has become harder to game — but violations still happen.

Intervention threshold: 65% (50% for passenger/hazmat).

3. Driver Fitness

Covers licensing, medical certificates, and driver qualification files. A high score here often means administrative problems — expired med cards, missing CDLs — not necessarily unsafe driving.

Intervention threshold: 80% (50% for passenger/hazmat).

4. Controlled Substances & Alcohol

Drug and alcohol violations detected during inspections. This is the rarest BASIC to trigger, but when it does, it's serious.

Intervention threshold: 80% (50% for passenger/hazmat).

5. Vehicle Maintenance

Brake problems, tire issues, lighting defects, load securement. This is the most commonly triggered BASIC because vehicle inspections turn up mechanical issues frequently.

Intervention threshold: 80% (50% for passenger/hazmat).

6. Hazardous Materials Compliance

Only applies to hazmat carriers. Covers proper placarding, packaging, and handling of dangerous goods.

Intervention threshold: 80%.

7. Crash Indicator

Based on crash history — but does not consider fault. A carrier that's rear-ended at a stoplight gets the same ding as one that caused a pileup. This is the most controversial BASIC.

Intervention threshold: 65% (50% for passenger/hazmat).

What Brokers Should Actually Look At

Don't use CSA scores as a pass/fail test. Instead:

1. Compare to thresholds. If a carrier is above the intervention threshold in any BASIC, FMCSA may already be investigating. That's a yellow flag.

1. Look at trends. A score that jumped from 30 to 70 in six months tells a different story than a stable 45.

1. Weight the BASICs differently. Unsafe Driving and Crash Indicator matter more for risk than Driver Fitness (which is often paperwork issues).

1. Check the inspection count. A carrier with 3 inspections and a high score is statistically unreliable. A carrier with 200 inspections and a high score has a real pattern.

1. Cross-reference with the safety rating. CSA scores and FMCSA safety ratings (Satisfactory/Conditional/Unsatisfactory) are separate systems. A carrier can have bad CSA scores and a Satisfactory rating, or vice versa.

Common Misconceptions

• "A score under 50 means they're safe." No — it means they're better than half their peers. Half of all carriers are "below average."
• "No score means no problems." It usually means not enough inspections to generate a score. New carriers and small fleets often have no SMS data.
• "CSA scores are public." Partially. FMCSA made crash data non-public in 2016 after industry pushback. The other BASICs are still visible on SMS results.

Bottom Line

CSA scores are a starting point, not the whole picture. Use them alongside insurance verification, authority checks, and operating history to make informed carrier vetting decisions.