FMCSA's Intervention Threshold Isn't a Clearance. It's a Priority Queue.

MC-1247893 had a 71st-percentile Unsafe Driving BASIC when a broker I know approved them in January. Below the intervention threshold. Green flag. She ran fourteen loads through them over the next four months.

In March, a new reporting cycle rolled in. Their score moved to 76th percentile. FMCSA's system flagged them as a candidate for a Warning Letter. In April, the Warning Letter went out. In May, they were still running loads — nothing had changed operationally, no investigation had started, no compliance review had been scheduled. In June, one of their drivers rear-ended a tractor on I-55 at 11 PM. Three injuries. A significant property damage claim.

The plaintiff's attorney subpoenaed the carrier's FMCSA file. The Warning Letter dated April 14th was in it. Then they subpoenaed my colleague's carrier file. She hadn't run a fresh SAFER pull since January. She had no documentation that she'd ever looked at the BASIC percentile after approval.

She settled. She didn't have to. If she'd been monitoring, she would've had the paper trail.

What FMCSA's SMS Actually Does

The Safety Measurement System — SMS — scores carriers against their peer group on seven BASIC categories: Unsafe Driving, Hours-of-Service Compliance, Driver Fitness, Controlled Substances/Alcohol, Vehicle Maintenance, Hazardous Materials Compliance, and Crash Indicator. Each score is a percentile ranking of violation rate against comparable carriers, weighted by inspection count and recency. It's a relative measure, not an absolute one. A carrier at the 70th percentile isn't necessarily dangerous. It means 70% of comparable carriers have a better violation rate.

The percentile scores feed FMCSA's intervention queue. When a carrier crosses the intervention threshold for one or more BASICs, they become a candidate for FMCSA action — first a Warning Letter, then potentially a Targeted Investigation or an off-site or on-site Compliance Review under 49 CFR Part 385. The outcome of a Compliance Review is a safety fitness rating: Satisfactory, Conditional, or Unsatisfactory. Unsatisfactory means the carrier is prohibited from operating until the violations are corrected.

Here's the part that matters for brokers: the queue is enormous. There are roughly 550,000 active interstate carriers in the U.S. and FMCSA's enforcement resources — inspectors, investigators, auditors — don't scale to that number. Carriers can sit above the intervention threshold for months, sometimes longer, before a Warning Letter goes out. And a Warning Letter is just a letter. It doesn't stop the carrier from running loads. It doesn't change their operating authority. It doesn't trigger an immediate compliance review. It says "FMCSA has noticed you; expect attention." After the letter, a Targeted Investigation might follow. After that, a Compliance Review. After that, a rating decision. The whole sequence can take a year or more from the moment a score crosses the threshold.

During all of that time, the carrier is legal. Running freight. Possibly running yours.

The Broker's Window of Exposure

Brokers who use SAFER and SMS at carrier onboarding tend to treat the initial check as a clearance event. The score was acceptable at approval — so the carrier is acceptable. That model breaks in two places.

First, BASIC scores change with every new reporting period. Violations age off; new inspections roll in; a bad quarter of citations can move a carrier's score fifteen percentile points in a few months. The carrier you approved in January with a 52nd-percentile Vehicle Maintenance score might have an 81st-percentile score by July if their fleet started generating brake violations on roadside inspections. The score at onboarding doesn't tell you what the score is today.

Second, and more directly relevant to the scenario above: the carrier's BASIC score crossing the intervention threshold is a fact that exists in the public record. It's not hidden. It's in the SMS portal. If you're a broker who approved a carrier, you had access to that information. Plaintiff's attorneys in negligent-selection cases will ask whether you checked, and when, and what you found.

Under Montgomery v. Caribe Transport II, the Supreme Court confirmed in May that the FAAAA does not preempt state-law negligent-selection claims against freight brokers. State courts apply their own negligence standards — and the question of whether a broker acted reasonably in selecting and continuing to use a carrier is squarely back on the table. "I checked when I onboarded them" is not a complete answer when the carrier's risk profile changed materially after onboarding and before the accident. The question will be whether you had reason to know and failed to act.

A FMCSA Warning Letter, dated before the load, is reason to know. You don't have to receive it yourself — it's in the public file. The argument "I didn't know they'd been sent a Warning Letter" works a lot less well when the mechanism to find out is a routine SAFER check that you could have run.

This Is Not About Being Paranoid

I want to be precise here, because there's a version of this advice that leads brokers to treat any carrier above the intervention threshold as untouchable. That's wrong.

A carrier above the intervention threshold is not necessarily unsafe. It means FMCSA has prioritized them for attention. It means you need to look more carefully. A carrier at the 78th percentile in Vehicle Maintenance might have a handful of lighting violations — annoying, but not predictive of a crash the way brake violations are. A carrier at the 73rd percentile in Unsafe Driving with two speeding violations across 80 inspections is different from one with 12 violations across 20 inspections. The percentile is a signal, not a verdict.

What changes when a carrier crosses the threshold is the standard you hold yourself to as a broker. You need to document that you looked — not just that you ran a check and got a number, but that you reviewed the underlying data, assessed the specific violations, and made a deliberate decision. If you decide to continue using a carrier who's above the threshold, that decision needs to be in writing, with a date, and with your reasoning. That's what holds up later.

A carrier file that says "Approved January 15, MC-1247893, BASIC scores reviewed, all below threshold, COI verified" is a reasonable starting record. A carrier file that has no entry from March, April, May, or June — when the score changed and the Warning Letter went out — is a gap. That gap is what plaintiff's counsel fills with inference.

Catching Threshold Crossings Before You're the Last to Know

The practical problem here is obvious: you can't manually re-run SAFER on every active carrier every week. Most brokers are managing hundreds of approved carriers, running multiple loads daily. Manually tracking BASIC score changes across all of them is not a realistic workflow.

This is what continuous monitoring exists for. DOTScreener's Continuous Monitoring re-runs the screen on every carrier in your active file and flags changes: authority status, insurance lapses, BASIC score movements, OOS orders. When a carrier's score crosses the intervention threshold, the system surfaces it before you find out from a plaintiff's attorney.

The other half is the documentation — a re-filed Carrier Selection Record when something changes. Under the continuous monitoring workflow, the original approval record is in the file. When a carrier's BASIC score moves materially, a re-run generates an updated record with a new timestamp. If the decision is to continue using the carrier, that decision is documented. If it's to pause or reduce volume pending improvement, that's documented too.

The paper trail doesn't just protect you in litigation. It makes you a better broker. When you're actively watching your approved carrier pool, you catch deteriorating carriers before they become problems — not after.

What 49 CFR § 390.9 Means Here

Brokers sometimes think carrier safety is solely the carrier's problem. The carrier is required to ensure their drivers comply with the FMCSRs under § 390.9. That's true. But § 390.9 addresses the carrier's obligation to its drivers — it doesn't create a pass for brokers who have reason to know a carrier is unsafe.

The broader principle from Part 390 is that the safety regulations exist to prevent accidents. Courts interpreting negligent selection claims look at whether a broker acted with reasonable care given what they knew or should have known. FMCSA's public SMS database is one of the primary tools available to brokers. If the information is public and accessible, a court will be skeptical of a broker who says they didn't look.

You don't have to be an expert in the SMS methodology to comply with this standard. You have to check consistently, document what you found, and demonstrate that you made real decisions based on real information. That's the paper trail.

How I Document This

For every carrier in active rotation, the carrier file in DOTScreener keeps a timestamped history of each screening. When a BASIC score changes materially — particularly when it crosses the intervention threshold — the monitoring alert triggers a re-run. I note the specific BASICs that moved, pull up the underlying violation data to assess severity, and record my decision: continue, reduce volume, or pause pending improvement.

That record looks like this:

That note is in the file. If this carrier has an accident next month, that record shows a broker who was actively engaged — not one who checked a box in January and moved on.

The combination of continuous monitoring and documented decision-making is what turns your carrier file from a compliance artifact into a defense document. Those aren't the same thing, but after Montgomery, you need both.

FMCSA is running their queue. You're running yours. The carriers you've approved are your responsibility until FMCSA shows up to handle theirs. Act like it.

---

— Mason Lavallet

Founder, DOTScreener.com