The crime of sabotaging traffic facilities refers to the deliberate destruction of tracks, bridges, tunnels, highways, airports, waterways, lighthouses, signs, or other destructive activities that are in use or have been delivered, causing the overturning of trains, cars, trams, ships, and aircraft , Destroy dangerous behaviors that are sufficient to endanger public safety. According to the above definition, Which of the following acts do not constitute crimes of damaging transportation facilities:. ['In order to obtain economic benefits, Lee and Wang steal traffic barriers, guide signs, and traffic lights at multiple intersections in a city and sell them.', 'Zhang lost his business because of the flight delay. When he was angry, he rushed into the airport runway and broke the airport runway indicator.', 'Sun was worried about being laid off. After planning, with the help of his fellow townmen, he unloaded the pair of rails without permission, and then stopped the train himself to create the illusion of meritorious performance.', 'Xiao Yan is an engineer of a construction engineering group. Due to labor conflicts with the company, he intentionally used inferior cement materials in the construction process of the bridge and secretly reduced the load-bearing capacity of the bridge.']