What should the officer confirm before the driver begins the Walk and Turn test?

Before a driver begins the Walk and Turn test, it is essential for the officer to confirm that the driver understands the instructions. This test evaluates not only the driver's physical coordination but also their cognitive ability to follow directions. If a driver does not fully understand what is required of them during the test, the results may be unreliable or invalid.

Ensuring comprehension is vital because the Walk and Turn test consists of specific steps that the driver must follow precisely, including maintaining balance, counting steps, and turning correctly. If the driver misunderstands the instructions, it could adversely impact their performance, leading to erroneous conclusions about their level of impairment. Therefore, confirming understanding is a fundamental step in conducting the test effectively and fairly.