I’m curious if blades and spikes mounted to stationary vehicles will hurt zombies that walk into them. I tested it on myself and it didn’t do anything, but I figure zombies might be a bit less aware of their environment.
To the best of my knowledge the vehicle has to be moving, though you could submit this idea to the suggestions board.
It would make barbed wire fences and spiked walls pretty interesting as far as stationary defences go.