From which side of the vehicle must an operator give hand signals?

Hand signals for vehicle operators are standardized to ensure clarity and safety on the road. The left side of the vehicle is where hand signals must be given because this side is typically the most visible location for other drivers, pedestrians, and cyclists. When a driver extends their left arm out of the driver's side window, it enables key movements to be communicated clearly, such as turning left or right or indicating a stop.

Given that the left side of the vehicle faces oncoming traffic in most driving scenarios, it maximizes visibility. This clarity is vital to prevent misunderstandings that could lead to accidents. In contrast, using the front, rear, or right side could obscure the signals from other road users, leading to unsafe situations. Thus, signaling from the left side is essential for effective communication while operating a vehicle.