Final answer:
A barricade is used to separate road users from work areas or unsafe areas, ensuring pedestrian safety, particularly in high-traffic areas. Proper safety measures, like traffic signals, can significantly reduce the incidence of accidents.
Step-by-step explanation:
The area that separates road users from the work area or an unsafe area is a barricade. Barricades are essential for maintaining pedestrian safety, especially in areas with high foot traffic like school campuses. They help to manage the flow of traffic and ensure that pedestrians can cross intersections safely, without having to dodge traffic. This is particularly important in regions where the number of accidents has risen substantially. Installing proper safety measures such as traffic signals and barricades reduces the risk of accidents, as indicated by the rise in accidents at a certain intersection leading to the installation of a traffic signal.