• To pass each Commercial Driver's License (CDL) knowledge test, an applicant must correctly answer at least 80 percent of the questions. (ecfr.gov)
• The TSA fee for a new or renewing Hazardous Materials Endorsement (HME) threat assessment is $85.25, effective January 1, 2025. (tsa.gov)
• The TSA fee for a new or renewing Hazardous Materials Endorsement (HME) threat assessment is reduced to $41.00 for applicants who already hold a valid TWIC card. (tsa.gov)
• A state must use a different version of the test when a Commercial Driver's License applicant retakes a previously failed knowledge test. (ecfr.gov)
• A commercial learner's permit (CLP) is valid for no more than one year from its initial issue date unless the holder retakes the general and endorsement knowledge tests. (ecfr.gov)
• CDL knowledge tests may be given in written form, verbally or in automated format, and in a foreign language as long as no interpreter is used. (ecfr.gov)
• A commercial learner's permit holder must be at least 18 years old and cannot take the CDL skills test in the first 14 days after the permit is first issued. (ecfr.gov)

Facts verified Oct 18, 2026 against Federal Motor Carrier Safety Administration (FMCSA), U.S. DOT; tests administered by each state driver licensing agency. Dates that have passed are removed automatically.