Get small metal tubes and cut the ends sharp, mount them in the wood but not secure so they pull out with the tire. Then bury the wood. This way they are hollow so they instantly let the air out of the tire. Think spike strips.
Get small metal tubes and cut the ends sharp, mount them in the wood but not secure so they pull out with the tire. Then bury the wood. This way they are hollow so they instantly let the air out of the tire. Think spike strips.