An "L" restriction is a restriction which prohibits the driver from operating a CMV which is equipped with air brakes. It does not, however, apply to vehicles not requiring a CDL.
Your CDL permit is in addition to the class of licence you had beforehand. So long as you were licenced to drive a car before you got your CDL permit, you can drive your own car while you possess a CDL permit.
If you have a Class A permit, and there IS NOT a restriction on it prohibiting you from driving tractor-trailers or air brake equipped vehicles, you can drive one, but you must have a fully licenced driver with you at all times.
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If you have a Class A permit, and there IS NOT a restriction on it prohibiting you from driving tractor-trailers or air brake equipped vehicles, you can drive one, but you must have a fully licenced driver with you at all times.
Restrictions include: B - corrective lenses required D - Anatomical Donor M- Restricted to Class B and Class C Passenger vehicles (This restriction goes with a P - passenger endorsement on a class A CDL) N- Restricted to class C Passenger vehicles (This restriction goes with a P - passenger endorsement on a class A CDL)
Take the written air brakes test, and perform a road test in a combination requiring a Class A CDL which is equipped with air brakes.
You would have to explain what state your licence is from, and whether or not that's a restriction code. To drive a semi, you would need a Class A CDL (unless it's a registered farm vehicle, exempt from CDL requirements, in which case, your state is free to establish their own licencing requirements). I know in North Carolina, a "No tractor trailer" restriction on a Class A CDL was an "8" restriction. Taking a quick glance, I can see that 57 is a CDL restriction code in Tennessee. If TN is your state, then your answer would be no - 57 is the "except tractor-trailer" restriction code for that state.
Class B CDL, and you can't have an "L" restriction (L restriction indicates you're not permitted to drive vehicles with air brakes). If you're expected to tow a trailer behind that dump truck which has a gross weight of over 10,000 lbs., then you'll be required to have a Class A CDL, again without an "L" restriction.
Learning how to spell so people understand what you mean would be a tolerably good start
You're going to have to pay for the permit... no two ways about it. If you take the written tests, the only thing you'll have to pay for until you get an actual CDL is the permit itself, and you can take those tests at the DMV - you don't have to go to a truck driving school for that.
Before you get a CDL, you will. You cannot legally operate any vehicle requiring a CDL on a public roadway without either holding the appropriate class of CDL (plus endorsement when necessary) or the appropriate class of CDL permit while being supervised by a licensed CDL holder.