A High HOS Score Scares Brokers. The One Below the Threshold Should.

A broker I know passed on a carrier last year because the HOS Compliance BASIC was at 87 — flagged, clearly over the intervention threshold. He sent a polite "we can't use you right now" email and moved the load to someone else.

Two weeks later he tendered a different flatbed run to a carrier out of Memphis. MC-1489234 / DOT-2891047, about 14 months of authority, clean insurance, $92,000 in steel coil. Unsafe Driving BASIC at 62%. Just under the 65% intervention threshold for that category. He didn't flag it. The number was green in his system and he moved on.

Six months after that, that carrier's truck hit a passenger sedan on I-24. Serious injury, totaled car, plaintiff's firm with a full-time truck-crash practice. Discovery included two years of that carrier's driving violations. The broker's file had a single SAFER screenshot showing the Unsafe Driving BASIC at 62%, and nothing else — no note on what drove the score, no inspection history review, no explanation of why 62% was acceptable.

The deposition question was short: "Did you understand that a 62nd percentile ranking in Unsafe Driving means 62% of carriers with similar road exposure had a better driving record?"

He understood it then.

The carrier he passed on for the high HOS score was probably fine. It had 4 trucks, a high score driven mostly by log-entry errors on one driver's ELD rollout, and no crashes in its history. The one he cleared because the Unsafe Driving was below threshold — that was the exposure.

Why the Thresholds Aren't All Calibrated the Same Way

There are seven BASIC categories in FMCSA's Safety Measurement System: Unsafe Driving, Crash Indicator, Hours-of-Service Compliance, Vehicle Maintenance, Controlled Substances/Alcohol, Driver Fitness, and Hazmat Compliance. The thresholds at which FMCSA intervenes vary by category and carrier type. For property carriers, Unsafe Driving, HOS Compliance, Vehicle Maintenance, Controlled Substances/Alcohol, and Crash Indicator all sit at 65%. Driver Fitness and Hazmat Compliance sit at 80% — meaning a property carrier can be at the 79th percentile in Driver Fitness before FMCSA sends a warning letter.

Most brokers treat these thresholds as a binary: under the line is fine, over the line is a problem. That model is wrong, and it's wrong in a way that creates real exposure after Montgomery v. Caribe Transport II, LLC.

The intervention threshold is the point at which FMCSA considers sending a warning letter or initiating a compliance review. It is not a determination of "safe" vs. "unsafe." It is a trigger for government action — calibrated partly around crash correlation, partly around data availability, and partly around the practical limits of FMCSA's enforcement capacity. A carrier at 64% in Unsafe Driving is one inspection away from triggering federal attention. That carrier's driving record is not substantively different from a carrier at 66%.

What the thresholds don't tell you — and what no broker's dashboard tells you — is that the seven BASICs have different relationships to actual crash risk. Some are crash-predictive. Some are compliance-predictive. That distinction is everything.

The Two That Actually Predict Crashes

Unsafe Driving and Crash Indicator.

Unsafe Driving measures driver behavior that directly causes crashes: speeding citations, following too close, reckless driving, improper lane changes, failure to use a seatbelt, failure to obey traffic controls. These are behaviors that show up in crash causation analyses because they are crash causation. When FMCSA built the SMS model, Unsafe Driving showed the strongest correlation with future crash frequency among carriers with similar exposure. That's not surprising — it measures whether your drivers are doing the things that cause crashes.

Crash Indicator measures past crash frequency and severity relative to comparable carriers. It's a direct historical record. A carrier at the 85th percentile on Crash Indicator has crashed more often than 85% of carriers with similar road exposure. There's no mystery there and not much context to add. More crashes than peers, weighted for severity.

If either of these is flagged — genuinely flagged, not "a 2-truck carrier had one speeding citation in 24 months" flagged — I want to know what's driving the number before I tender. That means pulling the actual inspection and crash records on SAFER, not just looking at the BASIC percentile.

And if either of these is not flagged but sitting in the 55-65% range? I still note it. Because 60% in Unsafe Driving is not "fine." It's "in the bottom half of safe carriers by driving behavior." That belongs in the carrier file with one sentence of context.

Controlled Substances/Alcohol

Different kind of hard stop. Any alert here warrants serious scrutiny regardless of how you feel about the other BASICs.

Under 49 CFR Part 382, motor carriers are required to run a compliant drug and alcohol testing program — pre-employment testing, random testing, post-accident testing, reasonable suspicion testing. The violations that push this BASIC over 65% for property carriers typically involve actual positive tests, test refusals, testing-program failures, or using a driver who hasn't cleared a Return-to-Duty process. You can get a paperwork violation that shows up here, but it takes real testing program dysfunction to move this number significantly.

One positive test in a 4-truck fleet can spike this BASIC fast. The risk isn't just the driver who tested positive. It's the question of what the carrier's culture looks like around compliance.

Vehicle Maintenance: The One Where You Need to Read Underneath

This category is where most brokers either over-react or under-react. A flagged Vehicle Maintenance BASIC deserves attention, but the number alone doesn't tell you whether you're looking at a culture of deferred maintenance or a carrier that keeps getting cited for burned-out marker lights.

49 CFR § 396.3 requires carriers to systematically inspect, repair, and maintain all vehicles subject to their control. Section 396.17 requires periodic inspections. When those requirements aren't met, it shows up in Vehicle Maintenance. But it shows up whether the violation is "brake adjustment out of spec" or "mud flap missing."

Those are not the same risk.

When I see a flagged Vehicle Maintenance BASIC, I pull the carrier's inspection history and look at the violation codes. If the inspection record is heavy on brake system violations — § 393.45 (brake tubing and hoses), § 393.47 (brake adjustment), § 393.48 (brake performance) — that's a pattern that tells me something about how this operator maintains equipment. Repeated brake violations across multiple inspections, multiple vehicles, multiple years: that's a carrier whose trucks are mechanically compromised on the road. That's a different conversation than a carrier whose score is elevated by lighting violations and paperwork errors.

The distinction matters for the same reason everything matters now: because in discovery, the inspection history comes out, and a plaintiff's expert witness will walk the jury through what "brake adjustment out of spec" means at highway speed.

HOS Compliance and Driver Fitness

Both matter. Both carry more false signal than Unsafe Driving or Crash Indicator.

Under 49 CFR § 395.8, drivers must maintain accurate records of duty status. A violation of § 395.8(e)(1) — "driver failed to record on-duty time" — feeds into the HOS Compliance BASIC the same way an actual over-the-hours violation does. The score doesn't distinguish between "driver ran 14 hours 40 minutes against a 14-hour limit" and "driver's ELD entries had a 15-minute gap that an inspector flagged." Those are genuinely different risks, and a carrier whose HOS BASIC is elevated entirely by the second kind is not the same as one whose drivers are running fatigued.

This doesn't mean you wave off a high HOS BASIC. It means you don't automatically pass on a carrier at 80% in HOS without looking at what's underneath — and you don't get spooked into passing on a carrier at 70% when the violations are documentation errors on a fleet that just switched ELD providers.

Driver Fitness is similar. The threshold is 80% for property carriers because Driver Fitness violations tend to be more administrative in character — expired medical certificates, incomplete driver qualification files, CDL endorsement issues. The serious violations (knowingly using a driver who fails the physical qualification standards under § 391.41) do show up here, but they tend to show up alongside a carrier with problems in every other category too. A carrier with a flagged Driver Fitness BASIC and clean Unsafe Driving, clean Crash Indicator, and clean Controlled Substances/Alcohol is a very different risk profile from a carrier flagged in five categories.

What You Should Actually Be Doing With This

Stop using the threshold as a pass/fail switch and start using it as a triage trigger.

My actual process: First thing I look at is Unsafe Driving and Crash Indicator. If either is above 55% — even below the threshold — I want a sentence in my file about what's driving it. Above 65%, I want the inspection history reviewed before I tender. Crash Indicator flagged means I'm pulling the actual crash register before I do anything.

Second, Controlled Substances/Alcohol. Any alert at all is a manual review. This one doesn't get a pass for being "just barely over."

Third, Vehicle Maintenance. Flagged? I look at the violation breakdown. Brakes, steering, tires: hard scrutiny. Lighting, paperwork, equipment labeling: context-dependent.

Fourth, HOS Compliance and Driver Fitness. I note them, I look at the trend, I check whether the score is recent or historic. I don't ignore them, but I also don't treat a 78% HOS BASIC with a downward trend the same as a 78% Unsafe Driving BASIC.

Hazmat Compliance: background unless I'm moving hazmat, in which case the entire analysis shifts.

How I Document This

For every carrier I vet, I record the full SMS snapshot — all seven percentiles with the pull date. For any BASIC over 50% in Unsafe Driving or Crash Indicator, I add a one-sentence note on what's driving the score and my call on it. "Unsafe Driving at 58%, below threshold, 11 inspections in window, one speeding citation in month 4, no pattern." That sentence takes two minutes to write.

If I decide to tender to a carrier with a flagged BASIC, I document the reason: what I looked at, what context I found, and what my call was. If I decide to pass, I document that too. The goal is a file that shows I understood what the numbers meant — not that I ran a report, saw green, and moved on.

After Montgomery v. Caribe Transport II, LLC, where the Supreme Court held unanimously that the FAAAA does not preempt state-law negligent-selection claims against freight brokers, the standard you'll be held to in state court is a reasonableness standard. A jury will be told that you had access to this data and asked whether a reasonable broker in your position would have dug deeper. "The number was under 65%" is not a sufficient answer if the Unsafe Driving was at 63% and the carrier's inspection history shows four speeding citations in nine months.

The seven BASICs aren't seven equal votes on whether to tender. They're seven different instruments, measuring different things, with different relationships to crash risk. Read them that way.

— Mason Lavallet

Founder, DOTScreener.com