Which of the following best explains the purpose of traffic signals?

The primary purpose of traffic signals is to ensure safety and regulate the flow of traffic. Traffic signals serve as critical tools in managing the movement of vehicles and pedestrians at intersections. By providing clear instructions through lights signaling when to stop or go, they help prevent accidents and reduce conflicts between different road users. This systematic regulation not only improves safety but also enhances the efficiency of traffic flow, allowing for smoother transitions and reducing congestion during peak times.

The other choices do not accurately reflect the essential role of traffic signals. While they might influence traffic in busy areas, their purpose extends beyond just busy intersections. The notion that signals could confuse drivers contradicts their design and function, which is aimed at clarity and guidance. Additionally, limiting the number of vehicles on the road is not a direct function of traffic signals; their role is more about managing the existing traffic rather than controlling the volume of vehicles allowed to travel on the road.