Speeding Over 15 MPH in a Commercial Vehicle in...

Speeding Over 15 MPH in a Commercial Vehicle in Kentucky: CDL Disqualification

Speeding is one of the most common citations issued on Kentucky highways. For regular drivers, a speeding ticket is an annoyance — a fine, maybe some points on your license. But for CDL holders, a speeding ticket for 15 mph or more over the posted limit is classified as a “serious traffic violation” under federal FMCSA regulations, and it triggers the accumulation clock that can lead to CDL disqualification. On Kentucky’s busy interstates — I-65 through Louisville’s UPS Worldport corridor, I-75 through Lexington, and I-64 connecting them — this distinction can mean the difference between a minor inconvenience and a career-threatening event.

At Clark + Harris in Lexington and Louisville, we defend CDL holders against speeding citations that threaten their commercial driving careers.

The 15 MPH Threshold: 49 CFR 383.51

Under FMCSA regulations (49 CFR 383.51(c)), speeding 15 mph or more over the posted speed limit in a commercial motor vehicle is classified as a “serious traffic violation.” This classification triggers the federal accumulation rule: two serious traffic violations within a three-year period result in a 60-day CDL disqualification, and three serious traffic violations within three years result in a 120-day disqualification.

The 15 mph threshold is measured from the posted speed limit, not from a “reasonable and prudent” standard. On Kentucky’s interstates, where the commercial vehicle speed limit is typically 65 mph (lower than the 70 mph limit for passenger vehicles in some sections), driving at 80 mph puts a CDL holder at exactly the serious traffic violation threshold. At 81 mph, you’re over it. The margin of error is razor-thin for commercial drivers.

Kentucky Speed Enforcement on Commercial Corridors

Kentucky State Police and local law enforcement agencies use multiple speed detection methods on the state’s commercial corridors. Radar and lidar speed detection are the most common methods, with officers positioned at known enforcement locations along I-65, I-75, and I-64. Aircraft speed enforcement operations are conducted periodically, using aerial observation to time vehicles between ground markings. Average speed monitoring through electronic toll and detection systems provides another enforcement layer.

Commercial vehicles are easy targets for speed enforcement due to their size and visibility. On I-65 through Louisville, where commercial traffic is heavy around the clock due to UPS Worldport operations, speed enforcement is particularly aggressive during peak traffic periods when speeding commercial vehicles create the greatest safety risk.

The Accumulation Danger for Frequent Kentucky Travelers

For CDL holders who drive through Kentucky regularly — including the thousands of drivers who run daily or weekly routes through Louisville and Lexington — the serious traffic violation accumulation rule creates significant exposure. A driver who received a speeding ticket on I-75 in Ohio six months ago and then gets a speeding ticket on I-65 in Kentucky now faces a 60-day CDL disqualification, even though neither ticket by itself would have triggered disqualification.

The accumulation rule counts serious traffic violations across all states. This means an Indiana driver who was cited for excessive speeding in Indiana and then cited again in Kentucky has reached the two-violation threshold. The FMCSA tracks violations nationally through the CDLIS (Commercial Driver’s License Information System), and there is no way to hide violations from one state to prevent accumulation in another.

Speed Measurement Challenges

Speed detection technology is not infallible, and CDL holders have the right to challenge the accuracy of speed measurements. Radar devices must be properly calibrated, and the officer must be trained and certified in the specific radar unit being used. Lidar devices require proper training and are affected by environmental conditions. Aircraft speed measurements depend on precise timing over measured distances and are subject to mathematical errors.

At Clark + Harris, we routinely challenge speed measurement evidence in CDL speeding cases. We subpoena calibration records, review officer training certifications, examine the specific conditions at the time of the alleged violation, and consult with speed measurement experts when the evidence warrants it. For CDL holders, where the difference between 14 mph over and 15 mph over is the difference between a regular ticket and a serious traffic violation, challenging the measured speed is critically important.

Negotiating Speeding Tickets for CDL Holders

One of the most effective strategies for CDL holders facing speeding citations in Kentucky is negotiation for a reduced speed or a different charge. If a 16-over citation can be reduced to 14-over, the serious traffic violation classification is avoided entirely. If the speeding charge can be reduced to a non-moving violation or dismissed in exchange for traffic school, the CDL impact may be eliminated.

These negotiations require an attorney who understands both Kentucky traffic court procedures and federal CDL implications. A general traffic attorney may view any fine reduction as a “win” without understanding that the critical issue for a CDL holder is whether the final resolution triggers the serious traffic violation classification.

Your CDL is your livelihood. Call Clark + Harris at 859-474-0001 before your commercial license is gone forever. Never just pay a speeding ticket if you hold a CDL. Contact our Lexington or Louisville office for a case evaluation and learn what defense options are available to protect your career.

Frequently Asked Questions

How soon should I contact Clark + Harris after being charged in Kentucky?

As soon as possible. Early representation protects your rights during questioning, preserves evidence, and often leads to better outcomes. Call 859-474-0001 — we respond promptly to new inquiries.

Does Clark + Harris represent clients throughout Kentucky?

Yes. We represent clients in all 120 Kentucky counties, both state District and Circuit courts, and federal courts in the Eastern and Western Districts of Kentucky.

What happens during a free consultation with Clark + Harris?

We review the specific charges and evidence, discuss available defenses, explain the likely process in the relevant court, and give you a clear roadmap of next steps — at no cost to you.

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