What is the primary physical task required in the Walk-and-Turn test?

The primary physical task required in the Walk-and-Turn test is walking heel-to-toe along a straight line. This test is designed to assess a person's balance, coordination, and ability to follow instructions, which can be impaired by alcohol or drugs. The individual must walk a specified number of steps in a straight line, with their heel touching the toe of the opposite foot for each step. This difficult task requires mental and physical coordination, making it a useful indicator of sobriety.

The other tasks mentioned, such as walking in circles while counting backwards, running a short distance and stopping, and jumping in place, do not reflect the specific requirements of the Walk-and-Turn test. Each of these alternatives would assess different abilities unrelated to the standardized evaluation of impairment conducted during a DUI investigation.