Which field sobriety test assesses the ability to follow instructions?

The Walk-and-Turn test is specifically designed to assess an individual's ability to follow instructions, which is a critical aspect of evaluating impairment. This test involves two primary components: the individual must listen to and comprehend the instructions given by the officer, and then demonstrate the ability to execute the steps of the task as directed. The test is performed on a straight line, where the subject must take a certain number of heel-to-toe steps in one direction and then return to the starting point while maintaining balance and following the instructions accurately.

This combination of listening, understanding, and executing a multi-step task makes it a strong indicator of an individual's overall cognitive and motor skills, which are often impaired when under the influence of alcohol or drugs. Thus, the Walk-and-Turn test serves a dual purpose of testing both physical coordination and the ability to process and follow directions.

While the Horizontal Gaze Nystagmus test focuses on eye movement to detect impairment, the One-Leg Stand test assesses balance, and the Alphabet test checks recall and cognitive function, none of them emphasize the instructional following aspect as prominently as the Walk-and-Turn test. Therefore, the correct answer highlights the unique role of the Walk-and-Turn test in gauging an individual's ability to follow