Final answer:
The available endorsements for CDL operators and their letter designations are Hazmat (H), Tanker (N), Passenger (P), and Doubles/Triples (T).
Step-by-step explanation:
The endorsements available to CDL operators and their letter designations are:
- Hazmat (H)
- Tanker (N)
- Passenger (P)
- Doubles/Triples (T)
Hazmat endorsement (H) is required for drivers who transport hazardous materials.
Tanker endorsement (N) is required for drivers who transport liquid or gaseous materials in bulk.
Passenger endorsement (P) is required for drivers who transport passengers.
Doubles/Triples endorsement (T) is required for drivers who operate vehicles with double or triple trailers.