(Video Link)
Barrier1 Systems is a defense contractor that has developed a number of amazing retractable road blocking systems. The above video shows several of them, starting with a net that can be kept below the surface of the road, then deployed in an emergency. Hitting one of them is like slamming into a brick wall.
Company Website via Geekologie
Methinks they didn't put as much thought into this as they should have. Rather than trying to stop in in two seconds, maybe they should stop it in five or ten?
Perhaps preventing these simple, misunderstood members of a passionate culture should be able to drive their bang-mobiles at high speed into an outdoor market. I guess it wouldn't be "good" and would make anyone who put up a defense like this members of a police-state.
Yeah, just right when those yankees forgot the orders to let a car pass with max priority thru a post gate: they shot to death an allied secret service agent, his driver and wounded the hostage he just recovered.
Just the first one to come to my mind.
How could anything go wrong?