CDL Endorsements and Restrictions:
Drivers who operate special types of CMVs also need to pass additional tests to obtain any of the following CDL License endorsements:
T – Double/Triple Trailers Endorsement (Knowledge Test only)
P – Passenger Endorsement (Knowledge and Skills Test)
N – Tank Vehicle Endorsement (Knowledge Test only)
H – Hazardous Materials Endorsement (Knowledge Test only)
S – School Bus Endorsement (Knowledge and Skills Test)
If a driver either fails the air brake component of the general knowledge test or performs the skills test in a vehicle not equipped with air brakes, the driver is issued an air brake restriction, restricting the driver from operating a CMV equipped with air brakes.
Source: 49 CFR 383
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