A World War II veteran told me that they used to string piano wire across the road at neck height to snag German motorcycle riders.
When I got to Vietnam you would see many of the jeeps that operated in cities like Saigon or Nha Trang had a hachet piece of metal sticking up from the front bumper.
In late 1945 and early 1946, a few Nazi “werewolf” dead-ender guerrillas strung piano wire across German highways to decapitate American GIs riding around in open jeeps and on motorcycles.
Germans did it to. A lot of jeeps had a steel tube or steel
angle mounted on the front bumper that stuck up s couple of feet higher than the drivers head. this was to cut or break wire or light cables.