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

(1) T –Double/triple trailers;

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(2) P –Passengers;

(3) N –Tank vehicles;

(4) H –Hazardous materials;

(5) X –Combination tank vehicles and hazardous materials; and

(6) S –School bus.

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