Its a road block pylon its basically meant to keep idiots (like said driver) out of places the don't belong, a prime example is people who try to go in the exit only lane at an airport and get their tires shredded by the claw spikes.
Yeah these are basically a solid steel bar that is pushed up by hydraulics with enough force to lift most cars right off the ground, or in this case thoroughly damage a car's engine. Sometimes these things are also concrete but those are steel.
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