Final answer:
A steady red arrow on a traffic light means vehicles must stop and cannot proceed with that movement until the light turns green, which helps manage traffic flow and increase safety.
Step-by-step explanation:
A steady red arrow displayed on a traffic light means that vehicles intending to follow the direction indicated by the arrow must stop and cannot proceed until the signal changes to green. Traffic signals play a crucial role in managing traffic densities and ensuring the safety of both drivers and pedestrians.
Red signals, including red arrows, are designed to control the flow of traffic, making vehicles slow down and preventing them from speeding through intersections, thereby reducing the risk of accidents.