Since I live in Kentucky, the particulars of this issue has been of great interest to me ever since I first got my CDL. As a result, I have brought this subject up to officers, administrators, a couple of legislators, and lawyers. I would say that most of Kentucky's DOT officers do know the specifics, but some do not. I certainly got some conflicting answers, especially from DOT officers. Surprisingly, the Transportation Cabinet administrators, legislators and lawyers were remarkably consistent in their answers. I Just find it a little unsettling that the very people who are out in the field enforcing the laws aren't really quite sure what those laws are.
It is certainly common sense to think,
"If you are engaged in commerce in a van in Kentucky you are a commercial vehicle and we expect you to stop at the scales."
Yet, Kentucky law says differently. The Transportation Cabinet of the Commonwealth of Kentucky, as mandated by KRS 281A.010, has adopted the definition of a commercial vehicle precisely as stated by the federal regulations.
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"Commercial motor vehicle," or CMV, means a motor vehicle or combination motor vehicle used in commerce that is:
(a) Designed to carry property and has a gross vehicle weight rating as determined by federal regulation which has been adopted into cabinet administrative regulations pursuant to KRS Chapter 13A;
(b) Designed to transport sixteen (16) or more passengers, including the driver;
(c) Transporting hazardous materials and is required to be placarded in accordance with Title 49, Code of Federal Regulations, Part 172; or
(d) Any other vehicle that is required by cabinet administrative regulation, pursuant to KRS Chapter 13A, to be operated by a licensed commercial driver.
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While Part (d) above allows for additional vehicle types to be included in the definition, to date there are none, other than some farm and horse transportation vehicles that are not included in the federal regulations (the trasnportation of Kentucky Thoroughbreds is serious business in Kentucky
)
Now, having said all that, if you pass a scale and the highly unlikely event of getting pulled over occurs, and you are issued a citation, you'll absolutely beat the ticket. If you are put out of service for failure to enter the scales, you'll absolutely be able to beat that, too, and you can pursue beating just as soon as your OOS time has expired.
If you get a ticket or are put OOS for some other reason, well, you're on your own there.
If you're ever pulled over for failure to enter a Kentucky scale, and they tell you that you're a commercial vehicle, ask for the KRS Statute that defines what a commercial vehicle actually is, because, the KRS Statues have adopted the federal regulations verbatim and they have not been amended by administrative regulation under KRS 13A.
As a side note, Kentucky is one money-hungry state. You have no idea. (I won't bore you with the details, but I've never seen so many inventive ways to double-tax you on stuff, or to tax you on stuff that no one else pays taxes for.) Failure to stop at a scale is serious money. If cargo vans were required to scale, you can bet yer a$$ that there'd be an army of KY DOT bears lined up just past every scale in the state, pulling vans over left and right. Expediters, plumbers, Stanley Steamers, electricians, you name it.