What is a requirement for the surface on which the Walk-and-Turn test should be conducted?

The requirement for the surface on which the Walk-and-Turn test should be conducted is that it should be dry, hard, level, and non-slippery. This specific surface quality is crucial because any irregularities, moisture, or slipperiness could affect the individual's ability to perform the test accurately. The Walk-and-Turn test assesses a person's balance, coordination, and ability to follow instructions, all of which can be compromised if the testing environment is not optimal. Conducting the test on a suitable surface ensures that any observed difficulties in performance are more likely to be indicative of impairment rather than simply a reaction to challenging environmental conditions.