Which test assesses a driver's ability to maintain balance on one foot?

The one-leg stand test is specifically designed to evaluate a driver's ability to maintain balance on one foot. During this test, the individual is instructed to stand on one leg while raising the other leg approximately six inches off the ground. The focus of this test is on the subject's ability to stabilize themselves, as impaired balance is a common indicator of intoxication.

This test requires physical coordination and balance, which can be significantly affected by alcohol consumption. Moreover, the conditions under which this test is conducted, such as the presence of distractions or the individual's physical state, further highlight the assessment of balance.

In contrast, the walk-and-turn test involves walking in a straight line and turning, which assesses other aspects like heel-to-toe walking and cognitive function during physical activity. The finger-to-nose test evaluates coordination and fine motor skills rather than balance. Lastly, a Breathalyzer test measures the blood alcohol concentration through breath samples and does not assess physical performance or balance at all.