What is the main purpose of using a turn signal in a bus?

Using a turn signal in a bus primarily serves to communicate intentions to other drivers on the road. This is essential for maintaining safety and ensuring smooth traffic flow. When a bus driver indicates their intention to turn or change lanes, other drivers are informed of these actions and can adjust their driving accordingly. This helps prevent accidents and misunderstandings that might arise from sudden maneuvers.

Effective communication through turn signals is especially important in a bus, given its size and the potential for blind spots that can obscure the driver's view of surrounding vehicles. By signaling, the bus driver provides critical information that enhances situational awareness for all road users, thereby promoting a safer driving environment.