The Administration may offer Maryland commercial driver’s license knowledge tests in written, electronic, or alternative formats. An applicant also shall be required to demonstrate the ability to read and understand highway signs regulating, warning, and directing traffic in English. The passing score on all commercial driver's license knowledge tests is 80 percent. The Administration shall offer the commercial driver’s license hazardous material knowledge test in a written or electronic format only. An applicant for a school vehicle endorsement, and an applicant surrendering a valid commercial driver's license with a school vehicle endorsement issued by another state, for a Maryland commercial driver's license, shall pass the commercial driver's license knowledge tests for: Passenger transport; and School vehicles. In addition to taking and passing the commercial driver's knowledge tests, an individual shall take and pass specialized tests to qualify for an endorsement to operate the following types of vehicles: Double or triple trailers; Passenger vehicles; Tank vehicles; Vehicles transporting hazardous materials as defined in 49 CFR §383.5; and School vehicles.