Who knew that "road blocker technology" exists and is so satisfying to watch?First off, here's an explanation. Those road spikes commonly seen at car rental parking lots don't magically appear—there's a whole industry out that that produces them. They're called (obviously) road blockers and they're used to "control access" to places that need beefed-up security, say your local Avis or military bases.They're not always spikes. Another piece of road blocking technology is seen in this video, which is a block of heavy duty steel that pops up from the ground to stop incoming traffic.It's not a surprise a large hunk of metal works blocking traffic, but what's shocking is the sheer force it does it. Skip to the :30 second mark in the video and admire the tenacity the road blocker, uh, blocks that speeding truck.Damn. Hope that truck had insurance.