FMCSA Roadside Inspection Violations: How They Affect Your CSA BASIC Scores

By CarrierLens Compliance Team • Last updated: 2026-05-01

Every roadside inspection violation discovered by state and federal inspectors feeds directly into FMCSA's Compliance, Safety, Accountability (CSA) Safety Measurement System — raising your BASIC percentile scores and increasing your exposure to compliance reviews, freight broker screening failures, and insurance premium increases. This guide explains how violations are scored, which ones matter most, and how to reduce their impact.

How Roadside Inspection Violations Are Scored in the CSA SMS

Each violation in an FMCSA inspection report is assigned:

Severity weight (1–10) — reflects the safety risk of the violation. Out-of-service conditions typically carry weights of 8–10.
Time weight (1–3) — reflects recency: violations within 6 months carry weight 3; 6–12 months carry 2; 12–24 months carry 1.

Violation score = Severity weight × Time weight. All violation scores in a BASIC category are summed across the carrier's inspections and compared against similarly-sized carriers to produce a BASIC percentile.

The Seven CSA BASICs and Their Alert Thresholds

BASIC	Alert Threshold (Property Carriers)	Key Violation Types
Unsafe Driving	65th percentile	Speeding, reckless driving, seat belt, phone use
HOS Compliance	65th percentile	Log violations, ELD non-compliance, driving past limits
Driver Fitness	80th percentile	Invalid CDL, medical certificate expired, driver OOS
Controlled Substances/Alcohol	80th percentile	Positive BAC, drug possession in cab
Vehicle Maintenance	80th percentile	Brake defects, tire failures, lighting violations
Hazardous Materials Compliance	80th percentile	Placarding, packaging, shipping paper violations
Crash Indicator	65th percentile	Preventable crashes (not violations — crash data)

Most Common Out-of-Service Violations by BASIC

Vehicle Maintenance

Brake adjustment out of service (most common OOS violation in any BASIC)
Tire below minimum tread depth or sidewall damage
Coupling device defects

HOS Compliance

Driving past 11-hour driving limit
Driving past 14-hour on-duty limit
No record of duty status (RODS) or incomplete records

Driver Fitness

Medical certificate expired or missing
CDL not valid for vehicle type (wrong class or endorsement)
CDL suspended or revoked

Violations That Carry Weight 10 (Maximum Severity)

Brakes out of adjustment meeting OOS criteria
Tire with no measurable tread depth
Driver operating with BAC 0.04% or higher
Driver refusing or failing drug test
Any safety violation found in combination with falsified records

How to Challenge Incorrect Violations Through DataQs

FMCSA's DataQs (Data Quality) system allows carriers to challenge inspection violations they believe are incorrect. Grounds for a successful DataQs challenge include:

The cited defect was already repaired before the inspection (with maintenance records as evidence)
The violation was incorrectly coded (wrong CFR citation applied)
The defect cited is not present on the actual vehicle listed in the inspection (vehicle ID error)
The inspection report contains factual errors in driver or carrier identification

Submit challenges at dataqs.fmcsa.dot.gov. The state agency that conducted the inspection reviews the evidence. Successful challenges remove violations from the FMCSA SMS immediately — often producing immediate BASIC score improvement for high-weight violations.

How Long Violations Stay in the SMS

FMCSA's SMS uses a 24-month rolling window. Violations older than 24 months are automatically removed from your BASIC percentile calculations. This means even the most severe violations age out of your score within 2 years — provided no new violations are added in the same categories.

Frequently Asked Questions

How do roadside inspection violations affect a carrier's CSA BASIC scores?

Each violation discovered during a roadside inspection is assigned a severity weight (1–10) and a time weight based on how recently it occurred: violations within 6 months carry a time weight of 3; 6–12 months carry 2; 12–24 months carry 1. The violation score is calculated as severity weight × time weight. All violation scores in a BASIC category are summed across the carrier's inspections over the past 24 months and compared to similarly-sized carriers to produce a BASIC percentile. Carriers above the alert threshold (typically 65th–80th percentile depending on BASIC) are publicly flagged and prioritized for compliance review.

What is the most common out-of-service violation at roadside inspections?

Brake violations — specifically brake adjustment defects — are consistently the most common out-of-service condition at Level I roadside inspections. Other frequent OOS conditions include: tires below minimum tread depth, brake hose/tube defects, lighting defects on active brake systems, and load securement violations. For driver-related OOS conditions: HOS violations (driving past 11 hours or on-duty past 14 hours without rest), medical certificate expired, and CDL violations are the most common. Carriers can reduce OOS rates significantly through thorough pre-trip inspections, DVIR compliance, and preventive maintenance programs.

How does a carrier challenge an inaccurate inspection violation through DataQs?

DataQs (Data Quality) is FMCSA's online system for challenging inspection and crash data that carriers believe is incorrect. To submit a DataQs request: (1) Access the system at dataqs.fmcsa.dot.gov; (2) Identify the specific inspection report and violation to challenge; (3) Provide documented evidence that the violation was incorrectly cited — such as maintenance records, annual inspection reports, or documentation that the defect was cited in error; (4) Submit the challenge. The state police agency that conducted the inspection reviews the challenge and decides whether to uphold or correct the record. Successful DataQs challenges remove the violation from the FMCSA SMS database, improving BASIC scores immediately.

Are all roadside inspection violations public in FMCSA's system?

Yes. All Level I through Level VI roadside inspection results — including violations found and the inspection outcome (passed/vehicle OOS/driver OOS) — are recorded in the FMCSA Motor Carrier Management Information System (MCMIS) and are visible in the publicly accessible FMCSA SAFER system and Compliance Snapshot reports. Carriers, shippers, brokers, insurers, and attorneys can see every violation and inspection on a carrier's record for the past 24 months. This is why challenging inaccurate inspection data through DataQs matters — incorrect violations are publicly visible and affect the carrier's safety fitness reputation even before they affect BASIC scores.

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