A "One Way Sign" is a traffic sign that indicates vehicles must only travel in one direction on a particular road. This sign helps prevent accidents by guiding drivers to follow the correct path and avoid entering areas where they could collide with oncoming traffic. Typically, the sign features a white arrow pointing in the allowed direction against a blue or black background. It is commonly found at intersections and along streets to ensure smooth traffic flow. Understanding and obeying the One Way Sign is essential for maintaining road safety and efficiency.