South Carolina Driver's Permit Practice Exam

What is the primary purpose of a traffic signal?

1. To improve flow of traffic

2. To provide attractive street decor

3. To enforce speed limits

4. To manage lane changes

The correct answer is: To improve flow of traffic

The primary purpose of a traffic signal is to improve the flow of traffic. Traffic signals are designed to control vehicle and pedestrian movement at intersections and crossing points, ensuring that traffic is efficiently coordinated. By regulating when vehicles and pedestrians can move, traffic signals help minimize congestion, reduce the likelihood of accidents, and enhance safety for all road users. Properly functioning traffic signals enable smoother transitions through intersections, ultimately leading to a better overall transportation experience. While the aesthetic aspect of street decor and managing lane changes are certainly considerations in urban planning and traffic management, they do not represent the primary function of a traffic signal. Similarly, while speed enforcement is crucial for safety, it is not the role of traffic signals to enforce speed limits directly; their main function is traffic control and flow.