South Carolina Driver's Permit Practice Exam

What is the purpose of a traffic signal?

1. To control traffic flow

2. To confuse drivers

3. To promote speeding

4. To provide decorative design

The correct answer is: To control traffic flow

The purpose of a traffic signal is primarily to control traffic flow. Traffic signals are designed to manage the movement of vehicles and pedestrians at intersections and other points on the road. By using distinct colors and signals, they indicate when drivers should stop, go, or yield, thereby enhancing safety and efficiency on the roads. This structured signaling helps to prevent accidents and ensures that all road users, including cars, buses, cyclists, and pedestrians, navigate intersections in an orderly manner. Traffic signals contribute to a predictable system that helps maintain the rhythm of both vehicular and pedestrian movement. Their presence significantly reduces the likelihood of collisions by providing clear instructions that optimize the flow of traffic based on current conditions.