What type of test must a driver take to obtain a CDL?

To obtain a Commercial Driver's License (CDL), a driver must pass a written knowledge test. This test is crucial because it assesses the driver's understanding of the rules and regulations regarding commercial driving, as well as safety practices, vehicle operation, and the responsibilities that come with being a commercial driver. The knowledge gained from this test is foundational for safe operation of large vehicles on public roads and is designed to ensure that drivers are competent and informed.

While the other tests mentioned play important roles in the licensing process, they serve different purposes. A physical capabilities test evaluates a driver’s physical fitness to operate a vehicle, ensuring they can safely handle the demands of driving. A driving history test may review an individual's past driving record, but it does not directly assess current knowledge required for CDL operations. A medical exam is essential for ensuring that a driver meets health standards, but it is not a knowledge assessment. Thus, the written knowledge test stands out as the necessary requirement for the CDL acquisition.