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  2. Transportation Research Center - Wikipedia

    en.wikipedia.org/wiki/Transportation_Research_Center

    The test track features level 2-mile (3.2 km) straightaways. Vehicle Dynamics Area: 50-acre (20-hectare) asphalt pad, with an acceleration loop at each end, is a multipurpose facility for vehicle dynamic testing, durability testing, brake testing, performance testing, product demonstrations, and driver

  3. Commercial driver's license - Wikipedia

    en.wikipedia.org/wiki/Commercial_driver's_license

    A commercial driver's license is required to operate a tractor-trailer for commercial use. A commercial driver's license (CDL) is a driver's license required in the United States to operate large and heavy vehicles (including trucks, buses, and trailers) or a vehicle of any size that transports hazardous materials or more than 15 passengers (including the driver).

  4. Driver's licenses in the United States - Wikipedia

    en.wikipedia.org/wiki/Driver's_licenses_in_the...

    This restriction is issued when a driver either fails the air brake component of the general knowledge test or performs the CDL road skills test in a vehicle not equipped with air brakes. M: CDL-A holders may operate CDL-B school buses only. N: CDL-A and CDL-B holders may operate CDL-C school buses only. O: Driver limited to pintle hook ...

  5. Transportation in the United States - Wikipedia

    en.wikipedia.org/wiki/Transportation_in_the...

    Obtaining a CDL requires extra education and training dealing with the special knowledge requirements and handling characteristics of such a large vehicle. Drivers of CMVs must adhere to the hours of service , which are regulations governing the driving hours of commercial drivers.

  6. Drug test - Wikipedia

    en.wikipedia.org/wiki/Drug_test

    A drug test (also often toxicology screen or tox screen) is a technical analysis of a biological specimen, for example urine, hair, blood, breath, sweat, or oral fluid/saliva—to determine the presence or absence of specified parent drugs or their metabolites.

  7. American Society for Nondestructive Testing - Wikipedia

    en.wikipedia.org/wiki/American_Society_for...

    The American Society for Nondestructive Testing, Inc. or ASNT is a technical society for nondestructive testing (NDT) professionals. ASNT evolved from The American Industrial Radium and X-ray Society which was founded in 1941. [ 1 ]

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