What should be placed between the aircraft and the approaching vehicle to avoid strikes?

Placing pre-positioned wheel chocks between the aircraft and the approaching vehicle is crucial in ensuring safety on the airfield. Wheel chocks are designed to immobilize an aircraft by preventing its wheels from rolling, thereby reducing the risk of movement when maintenance is being conducted or when an aircraft is stationary. They serve as a physical barrier that helps to delineate the safe distance an approaching vehicle should maintain, thereby minimizing the risk of accidental strikes.

In contrast, while cone markers can be used to outline boundaries or areas of caution, they do not provide the same physical restraint or security as wheel chocks. Road barriers are typically used to block off pathways or areas and may be impractical for immediate use around aircraft. Landing mats, primarily designed to provide a stable surface for aircraft during landings or takeoffs, serve a different function and do not contribute effectively to preventing vehicle strikes on the airfield. Overall, pre-positioned wheel chocks are an essential tool for maintaining safety and preventing accidents in high-traffic areas like airfields.