To operate the privlidges of a private or commercial license, you must have a valid medical certificate. 2nd class for commercial, 3rd class for private. This requires you to get a medical examination by a AME (aviation medical examiner)
If you operate a commercial vehicle with a Gross Vehicle Weight Rating of more than 10,000 lbs., you're supposed to have the DOT Medical Card.
To operate ANY vehicle which requires a CDL of ANY class in ALL states (this is federal law - it doesn't vary by state), the driver must have, along with the appropriate class of CDL (A, B, C), a DOT Medical Card. However, this is assuming you're were referring to a Class C CDL - several states issue a non-CDL Class C licence.
Yes, you would. Without the trailer, you could operate it with either a Class A or Class B CDL.
No. While some states may expressly allow a vehicle to be operated on private property without a CDL (although it does put them in conflict with the FMCSR), you absolutely cannot legally operate a tractor trailer or commercial straight truck on public property and roadways without possessing the appropriate class of licence for that vehicle. Now, if that tractor trailer is a registered farm vehicle, rather than a commercial vehicle, the story will be a bit different, and different states have different regulations on that.
If you don't have a CDL, you can't operate a commercial vehicle. You can't even so much as be in actual physical control of the vehicle (in the driver's seat with the motor running). Even if you possess a non-CDL Class A or B licence, this holds true - a non-CDL Class A/B only permits you to operate vehicles which fall under the exemptions for CDL requirements.
Not sure what you mean, exactly. Class A is considered the "higher" classification, yes. If you have a Class A CDL, you can operate vehicles requiring that class of licence or any class below that. You could operate a vehicle requiring a Class B CDL, for example, but a driver with a Class B CDL wouldn't be permitted to operate a combination requiring a Class A CDL.
What type of Class C licence, exactly? A basic drivers licence in California is known as a Non-Commercial licence, or Class C licence. HOWEVER, there is a Class C Commercial Drivers Licence, intended for vehicles under 26,000 lbs. GVWR which are placarded to haul hazardous materials, designed to transport more than 15 persons (including the driver), etc. If it requires the non-commercial licence, there's no requirement to possess a medical card. If it requires the Class C Commercial Drivers Licence, then, under federal law, you must always have a valid DOT medical card in your possession at all times when operating that vehicle.
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You do not need to have any type of license to insure and register a vehicle in Alberta. You'll obviously not be able to operate it without one, or in your case without a fully licensed driver in the vehicle with you or as per the provisions of your class 7 license.
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No. Motor homes are exempted from CDL requirements (for better or worse). Some states, however, may require residents to obtain a non-commercial equivalent licence (Class A or B) for non-commercial vehicles matching the weight requirements for the equivalent CDL licence.