Which countermeasure is often used to improve intersection safety?

When considering countermeasures to improve intersection safety, all listed options—speed bumps, traffic signals, and roundabouts—contribute significantly in different ways to enhancing safety.

Traffic signals play a critical role in managing the flow of vehicles and pedestrians at intersections. They help organize traffic movement by providing specific times for vehicles to stop and go, ultimately reducing the likelihood of collisions due to uncontrolled movements.

Roundabouts are designed to minimize the points of conflict between vehicles, allowing for continuous flow and reducing speeds as drivers navigate through. They can decrease the severity and frequency of crashes compared to traditional intersections by minimizing the angles at which vehicles collide.

Speed bumps can also be effective in reducing vehicle speeds, especially in areas where traffic calming is necessary. By slowing down traffic at intersections, they provide pedestrians and other road users with a safer environment to navigate.

Each of these measures supports the overall aim of improving intersection safety. Therefore, selecting the option that encompasses all these measures accurately reflects their collective importance in creating safer intersections.