How far in advance must you signal before exiting a highway?

Answer: C — 500 feet

Signaling before exiting a highway is crucial for ensuring safety and clear communication with other drivers. The requirement to signal at least 500 feet in advance before exiting a highway allows sufficient time for drivers behind you to understand your intentions and adjust their driving accordingly. This distance provides ample notice to fellow motorists, which is particularly important at highway speeds where traffic is moving quickly. Failing to signal in a timely manner could lead to confusion and potentially hazardous situations on the road. Thus, maintaining this 500-foot signaling distance helps enhance overall traffic safety and facilitates smoother lane changes and exits.