It applies only to Commercial Driver Licenses (CDLs). "U" is the code for "intrastate only" (as it pertains to operation of a Commercial Motor Vehicle). It's given to people who either get a CDL when they are below the age of 21 or who self-certify themselves as "intrastate exempt" or "intrastate non-exempt" drivers.
Restriction codes vary by state. You would need to specify the state you are referring to.
Varies by state. Usually, a regular license, but which has a restriction of some form on it.
If your drivers license is revoked in one state, can you get a drivers license in another state?
No
18 and already holding a valid Ohio drivers license. If you get a CDL before you're 21, you'll get an "intrastate only" restriction which prohibits you from operating a CMV outside of your home state, and you will not be able to get a hazmat endorsemen.
No you cannot get a drivers license in Florida if you have had your license suspended in another state.
No
No. Federal states that if you have a CDL in one state, you cannot have any other drivers license in any other state.
None
No
Short answer, none.
No. Not until your license is reinstated in your state. No state will give you a license until you clear that up.