It is mandatory to signal anytime you intend to turn, change lanes, or exit a roadway because signaling communicates your intentions to other drivers, enhancing overall traffic safety. Signaling is crucial to preventing accidents by minimizing misunderstandings and providing ample warning to other drivers to anticipate your actions, thus maintaining orderly flow and ensuring safe transitions on the road. Proper signaling is a fundamental component of defensive and courteous driving, promoting clear communication on the road.