How CSA Intervention Thresholds Actually Work — and Why 65% Means 'Sue-Able'

The number that gets thrown around in carrier-vetting conversations is 65%. As in: "the carrier is below 65 on the Unsafe Driving BASIC, we're fine." This is one of those numbers that everyone repeats and very few people actually understand.

65 is not a passing grade. It's the lowest threshold FMCSA uses to flag a carrier for intervention, and it only applies to certain BASICs and certain kinds of carriers. Understanding the system underneath that number matters because the people on the other side of the negligent-selection lawsuit — the plaintiffs' lawyers and the insurance adjusters who pay them — understand it cold.

What "intervention threshold" actually means

FMCSA's Compliance, Safety, Accountability program prioritizes carriers for safety interventions based on their performance in the Behavior Analysis and Safety Improvement Categories. When a carrier's percentile in a given BASIC equals or exceeds the published intervention threshold, that BASIC becomes an "alert" — internally, it's a signal to the agency that this carrier should move up the priority list for warning letters, focused investigations, or formal compliance reviews.

The threshold is not a safe/unsafe binary. It's the agency saying: "below this line, we're not actively pursuing you; at or above this line, we are." A carrier at 64% in Unsafe Driving is not "safe." They're 1 percentile below FMCSA's intervention line. A carrier at 66% is over the line. The performance difference between the two carriers is tiny. The bureaucratic difference is significant.

For broker-liability purposes, the line matters because it's the line at which FMCSA itself has flagged the carrier. When you tender a load to a carrier whose Unsafe Driving BASIC is at 78, you are not making an obscure judgment call — you are tendering to a carrier the federal government has formally flagged for safety intervention. That fact will be in the FMCSA record, and that fact will be in front of the jury.

The three threshold sets

This is where most people simplify too far. There are three intervention thresholds, depending on what kind of carrier:

General carriers (most freight): 65% for Unsafe Driving, HOS Compliance, and the Crash Indicator. 80% for Driver Fitness, Controlled Substances/Alcohol, Vehicle Maintenance, and Hazmat Compliance.

Hazmat (placardable hazardous materials) carriers: 60% for the high-risk BASICs (Unsafe Driving, HOS, Crash Indicator). 75% for the others. Tighter because the consequences of hazmat incidents are bigger.

Passenger carriers (buses, motor coaches): 50% for the high-risk BASICs. 65% for the others. Tightest of all because passenger crashes kill people in greater numbers per event.

So when someone says "the carrier is under 65 in everything, we're fine" — that's only the right number if the carrier is general freight. For a hazmat carrier, the bar is 60. For passenger, it's 50.

The "high-risk" BASICs are not all created equal

Within the high-risk three, there's a hierarchy of what's most predictive — and what most directly opens a broker to negligent-selection exposure.

Unsafe Driving is the most direct. It captures speeding, lane changes, reckless driving, failure to use seat belt, texting, and a few similar offenses, all observed at roadside. When a fatality crash happens and the carrier had a 76 in Unsafe Driving the month before, plaintiffs argue you tendered a load to a known speeder.

HOS Compliance is second. It captures logbook violations and driving-over-hours violations. Fatigue is a major contributor to fatality crashes, and a high HOS percentile is exactly the data point a plaintiff uses to argue the carrier had a known fatigue problem.

Crash Indicator is the third high-risk BASIC and the one brokers tend to focus on. It's also the least useful for predictive purposes — it's a tally of crashes that already happened. By the time it's high, the litigation is already happening or has happened. It's useful as a confirmation signal, not a predictor.

If you're going to weight one BASIC more heavily than the others in your vetting, Unsafe Driving is it.

A concrete scenario

You're vetting two flatbed carriers for a Houston-to-Phoenix load.

Carrier A: MC-1281402 / DOT-3201874. Unsafe Driving 67% (just over threshold). HOS 41%. Crash Indicator 22%. Vehicle Maintenance 39%.

Carrier B: MC-1352109 / DOT-3289473. Unsafe Driving 62% (just under threshold). HOS 31%. Crash Indicator 28%. Vehicle Maintenance 74%.

Both are roughly comparable in overall safety. Both have one BASIC near or over a threshold. Which one is harder to defend tendering to?

Carrier A's Unsafe Driving is over threshold. That's a high-risk BASIC and the percentile cleared 65. In the plaintiff-friendly framing, A was *flagged by FMCSA* for unsafe driving and the broker tendered anyway.

Carrier B's worst score is Vehicle Maintenance at 74. That's a non-high-risk BASIC. The threshold there is 80, so the carrier is below it. The argument against tendering to B is harder to make on the BASIC data alone, but the maintenance score is still a yellow flag — especially for a flatbed load with cargo securement requirements.

Both deserve a written diligence note. Neither is automatically out. The point is the analysis: the threshold by carrier type, the high-risk-vs-other BASIC distinction, and the explicit recognition that A's score is "over the federal intervention line" and B's is not.

A second scenario — the trap

A new dispatcher at your brokerage runs an MC# in SAFER and sees: "Property carrier, general freight, all BASICs below 65, no alerts." Looks clean. Tender.

What the dispatcher missed: the carrier is *also* placarded for hazmat on a small fraction of its loads. The hazmat threshold is 60, not 65. The Unsafe Driving BASIC is at 63. For a general carrier that's below threshold; for a hazmat carrier on hazmat loads, it's over.

Your shipper has handed you a load that's general freight, not hazmat — so the 65 threshold applies to your tender decision. But the next time the dispatcher sees this carrier, the load might be a placarded haul, and the same BASIC score becomes an over-threshold flag they didn't catch.

The fix is process: every carrier vetting record should note the carrier's operation type (general / hazmat-placarded / passenger) and the corresponding threshold applied to the load type tendered.

The regulation, in plain English

CSA is not itself a regulation — it's an FMCSA enforcement program. The legal authority for the safety oversight comes from 49 U.S.C. § 31144 (safety fitness) and the rulemakings at 49 CFR Part 385 (safety fitness procedures). The underlying violations that feed BASIC percentiles are violations of the FMCSRs — Part 391 (driver qualification), Part 392 (driving rules), Part 393 (parts and accessories), Part 395 (HOS), Part 396 (inspection, repair, and maintenance), and Part 397 (hazmat driving rules).

What this means at load-tender time: when you look at a BASIC percentile, you're really looking at a rate of citations *under those CFR parts* relative to peer carriers. A 78% Unsafe Driving score means the carrier has been cited under Part 392 at a rate worse than 78% of peers. That citation history is admissible. The percentile is a publicly-accessible summary of it.

How I document this

Three things per carrier:

1. **The carrier's operation type** (general / hazmat-placarded / passenger) and the applicable threshold set noted in the file. Hazmat is a 60, not a 65. Passenger is a 50, not a 65.

2. **A snapshot of all BASIC percentiles**, including "Insufficient Data" notes for categories without scores. Discovery requests are not narrow.

3. **For any BASIC at or near threshold**, a short written rationale for the tender decision. One paragraph. Specific. Tied to mitigation: pre-trip attestation, restricted equipment, additional insurance verification, whatever applies.

I want to be clear about something. The threshold is not the bar between safe and unsafe carriers. There are carriers at 64% who are unsafe and carriers at 75% who are operating clean today. The threshold is the bar between "FMCSA has flagged this carrier" and "FMCSA has not." Your job as a broker is not to grade safety. It's to *demonstrate* that you understood the public information available about the carrier and made a reasoned tender decision in light of it.

After *Montgomery*, that demonstration is the difference between a defensible file and a settlement check.

— Mason Lavallet

Founder, DOTScreener.com

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Sources

• [FMCSA Safety Measurement System (SMS) Methodology (PDF)](https://csa.fmcsa.dot.gov/Documents/SMSMethodology.pdf)
• [FMCSA — Compliance, Safety, Accountability (CSA) program overview](https://csa.fmcsa.dot.gov/about/Measure)
• [Foley Services — FMCSA Tweaks Intervention Thresholds for Certain Carriers](https://www.foleyservices.com/news/fmcsa-tweaks-intervention-thresholds-for-certain-carriers/)
• [FMCSA — Carrier Safety Records and CSA process](https://www.fmcsa.dot.gov/safety/company-safety-records)
• [Hanson Bridgett — Montgomery v. Caribe Transport II analysis](https://www.hansonbridgett.com/publication/260514_8509_supreme-court-faaaa)