What is the purpose of the walk-and-turn test?

The walk-and-turn test is designed to evaluate a driver's balance and their ability to follow instructions while impaired. This test is a standardized field sobriety test used by law enforcement to gain insights into a person's physical and cognitive capabilities when under the influence of alcohol or drugs.

During the test, the individual must perform a series of specific tasks that require coordination and focus, such as walking a straight line heel-to-toe, turning on one foot, and returning in the same manner. Successfully completing these tasks demands concentration, balance, and the capacity to follow multi-step instructions—abilities that can be significantly impaired by alcohol consumption.

By watching how a subject performs these tasks, officers can make inferences about a driver’s level of impairment. If a person struggles with balance or fails to follow the instructions correctly, it serves as an indicator that their ability to operate a vehicle safely may be compromised. This structured assessment provides vital evidence that can influence the officer's decision-making on whether to proceed with an arrest for DWI (Driving While Intoxicated).