The written examination administered for a commercial driver license shall consist of a minimum of fifty (50) multiple-choice questions. In addition, the combination vehicle test administered for a Class A commercial driver license shall consist of a minimum of twenty (20) multiple-choice questions. The minimum passing score for each written examination shall be eighty percent (80%).
(2) Endorsement or restriction examination. The minimum number of multiple-choice questions and the minimum passing score for each endorsement or restriction examination shall be as follows:
(A) "P" passenger endorsement - 20 questions - 80% score
(B) "H" hazardous materials endorsement - 30 questions - 80% score
(C) "N" tank vehicle endorsement - 20 questions - 80% score
(D) "M" motorcycle endorsement - 20 questions - 75% score
(E) "S" school bus endorsement - 20 questions - 80% score
(F) "T" double or triple trailers endorsement - 20 questions - 80% score
(G) Air brakes - 25 questions - 80% score. Failure to pass at least 80% of the 25 questions regarding air brakes will result in a restriction code "L" (Vehicle Without Air Brakes) being placed on the applicant's license upon issuance. The applicant shall be prohibited from taking the skills examination in a vehicle with air brakes.
(c) Alternate method of examination. The Department may provide an alternate method for the written examination for an applicant who cannot read or has a language barrier.
(d) Retesting. An applicant failing the written examination may be granted the opportunity to retest on the next regular business day.
(e) Discretionary examination. Any examination, as deemed necessary by the Department, may be administered by the Department as required for the establishment and authorization of a special endorsement or to permit the operation of commercial motor vehicles.
Department of Public Safety Rules Title 595 Chapter 11 Section 595: 3-6