It's fun to watch this specialized truck build a tunnel

This truck supports pieces of a tunnel arch as they are lowered from a crane. The body of the truck is covered with rollers so it can drive out of the tunnel and let the pieces fall into place.

Zipper Truck - Vault Assembly System from mechanical_gifs

from Boing Boing http://ift.tt/2eFXSeI
via IFTTT

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