Arizona Driving Permit Written Practice Test

What are signal lights for?

1. Decorative purposes

2. Vehicle speed control

3. To regulate the direction and flow of traffic

4. Weather forecasts

The correct answer is: To regulate the direction and flow of traffic

Signal lights are primarily used to regulate the direction and flow of traffic. Choosing option A is incorrect because signal lights serve a functional purpose rather than a decorative one. Option B is incorrect because vehicle speed is controlled by speed limits and driver behavior, not signal lights. Option D is incorrect because signal lights do not provide weather forecasts, they only regulate traffic.