What is the primary function of turn signals?

The primary function of turn signals is to alert other drivers of your intentions to turn or change lanes. This is crucial for ensuring safety on the roads, as it allows other road users to anticipate your actions and respond appropriately. By signaling your intentions, you can help prevent accidents that might occur if drivers are unaware of your maneuvers. Proper use of turn signals enhances communication between drivers, contributing to smoother traffic flow and reducing the likelihood of misunderstandings.

The other options, while related to driver communication and roadway safety, do not reflect the primary purpose of turn signals. Warnings of a traffic stop or indicating vehicle speed changes serve different functions and are not the main intention of using turn signals. Notifying emergency vehicles is also a specific scenario not covered by the general purpose of turn signaling.