What does a left arm and hand pointed downward signify?

When a driver extends their left arm and hand pointed downward, it is a universal hand signal that indicates the intention to slow down or come to a complete stop. This gesture serves as a visual cue to other road users, including vehicles and cyclists, alerting them of the driver's intention. Recognizing this signal is critical for maintaining safety on the road, as it helps prevent accidents by clearly communicating the driver's actions in a way that can be easily understood, even if the vehicle's turn signals are not functioning properly. The downward position of the arm specifically differentiates this from other signals, such as turning left or right, which are indicated by extensions in other directions. By properly using this hand signal, a driver demonstrates not only their intention to manage speed but also contributes to overall road safety and awareness among all participants.