Which of the following is designed to minimize damage from impacting vehicles?

Barriers are specifically designed to minimize damage from impacting vehicles by absorbing the energy of collisions and redirecting vehicles away from dangerous areas. These structures, which can include concrete walls, metal guardrails, or tension cable systems, serve multiple purposes in traffic safety. They help to prevent vehicles from crossing over into opposing lanes of traffic, protect pedestrians, and shield sensitive areas such as construction zones or roadside obstacles.

In contrast, the other items listed have different functions. Traffic cones are mainly used for temporary traffic management and to alert drivers to hazards; they don't provide substantial protection against vehicle impacts. Delineators are used to improve visibility and guide drivers along roadways, yet they also lack the structural integrity to withstand collisions effectively. Flashing lamps are employed for signaling and alerting, primarily in low visibility conditions, but do not serve the purpose of damage mitigation in the event of an impact.

Therefore, barriers stand out as the best option for effectively minimizing damage from vehicle impacts.