What 391.45(a) means in plain language
FMCSR 391.45(a) requires that you have a valid medical examination certificate either in your possession or on file with your state's driver licensing agency. This certificate proves you've passed a Department of Transportation medical exam administered by a certified medical examiner. The exam checks your vision, hearing, blood pressure, ability to control your vehicle, and other factors that determine whether you're medically qualified to drive commercially.
If you're operating a commercial motor vehicle without that certificate—whether it's expired, never obtained, or simply not available for inspection—you're in violation of 391.45(a). The violation doesn't require that you're medically unfit; it only requires that the certificate is missing or invalid.
What our enforcement data actually shows
Across our 13 million inspection records, 391.45(a) has generated 71 citations all-time, making it ranked #1519 of 3,036 FMCSR codes by citation volume. In the last 12 months, we recorded 0 citations for this code, and 0 in the last 90 days. When citations have been issued, 5 drivers were placed out of service and 66 were not, resulting in a 7.0% out-of-service rate. This is substantially lower than the all-FMCSR average OOS rate of 31.4%, indicating that inspectors typically issue this citation as a warning rather than an immediate roadside removal.
Who gets cited most
Our inspection records don't show sufficient state-level distribution data to identify a clear geographic pattern for this violation. However, the carriers in our database with the most citations include Maryland Tree Experts with 2 citations across their fleet history. The data spans multiple small and mid-sized carriers, each with single citations, suggesting this violation is scattered rather than concentrated in particular fleet operations.
How severe is this compared to similar codes
Within the Driver Fitness category, 391.45(a) sits in a middle tier of enforcement intensity. Two peer codes illustrate the spectrum: 391.41APC (Operating a property-carrying vehicle without a valid medical certificate in possession or on file) has generated 49,539 citations with a 97.1% out-of-service rate—meaning nearly every citation results in immediate removal from service. By contrast, 391.41(a) (Physical qualification—general) has 42,270 citations with only a 16.2% OOS rate. The 391.45(a) OOS rate of 7.0% suggests that when inspectors cite it, they often view it as a correctable paperwork issue rather than an immediate safety threat, unlike the companion code 391.41APC.
How to avoid it
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Obtain and renew your DOT medical certificate on schedule. Your certificate is valid for 24 months (or 12 months if you're 65 or older or have certain medical conditions). Mark the expiration date on your calendar and schedule your exam with a certified medical examiner at least 60 days before it expires.
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Carry proof of your certificate during every shift. Keep a copy in your vehicle—either the original card issued by the examiner or documentation confirming it's on file with your state's licensing agency. Inspectors need to verify it on the spot.
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Update your state licensing agency immediately after passing the exam. Don't assume the medical examiner's office will file it. Contact your state's CDL program directly to confirm your certificate is recorded in their system.
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If you're renewing your CDL, coordinate with your medical certification. Time your medical exam so it doesn't lapse between your driver's license renewal and your medical recertification.
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Know your exemptions. Some exempt operations may not require the certificate; however, if you operate any property-carrying or passenger-carrying vehicle under federal CDL rules, the certificate is mandatory. When in doubt, treat it as required.