The endorsements to a commercial driver license shall be as follows:

1. (1) T --Double/triple trailers;
2. (2) P --Passengers;
3. (3) N --Tank vehicles;
4. (4) H --Hazardous materials;
5. (5) X --Combination tank vehicles and hazardous materials; and
6. (6) S --School bus.

Source: SL 1989, ch 267 , § 17; SDCL § 32-12-97; SL 2001, ch 171 , §§ 89, 115.