What is the main purpose of barriers on bridges?

Answer: B — To provide vehicular containment and prevent rollover

The primary purpose of barriers on bridges is to provide vehicular containment and prevent rollover. Barriers are essential safety features that help keep vehicles within the confines of the roadway, especially on elevated structures where the risk of falling off is significant. They are designed to absorb the impact from a vehicle effectively, reducing the chances of serious accidents and protecting both drivers and passengers. While barriers may have additional benefits, such as contributing to aesthetic appeal or serving as lane dividers, these functions are secondary. The critical aspect of barriers is their role in preventing vehicles from crossing over into dangerous areas, thereby maintaining the safety of traffic flow on and around the bridge.