A turn signal lever is a control found in most vehicles, typically located on the steering column. It allows drivers to indicate their intention to turn or change lanes by activating the vehicle's turn signals. When the lever is pushed up or down, it engages the corresponding lights on the outside of the vehicle, alerting other drivers. Using the turn signal lever is essential for safe driving, as it communicates a driver's intentions to others on the road. Proper use of turn signals helps prevent accidents and promotes smoother traffic flow, making it a crucial aspect of responsible vehicle operation.