What is one reason for conducting field sobriety tests?

Conducting field sobriety tests serves specifically to evaluate the driver’s level of intoxication. These tests are designed to assess physical and cognitive functions that can be impaired when a person is under the influence of alcohol or drugs. By observing a driver's performance on tasks that measure balance, coordination, and information processing, law enforcement officers can gather evidence to support the determination of whether the driver is fit to operate a vehicle safely.

The other options focus on unrelated aspects. Assessing whether a driver is legally parked and checking for traffic violations do not directly relate to determining intoxication levels. Similarly, while understanding a vehicle's condition can contribute to overall safety, it does not address the primary goal of assessing a driver's sobriety and ability to operate a vehicle. Thus, the primary objective of these tests is to ascertain whether a driver is impaired, reinforcing the importance of option C as the correct answer.