Guard Rails

See the above picture ? Just a road, with guard rails right ?

I walked by and there were construction workers puting up guide wires and doing measurements, and no guard rails.

An hour and a half later , I walk back , and they just finishing up. And there were guard rails. Sunk into the ground, ready and waiting to be crashed into , the works.

An hour and a half ? Dang that was fast. I figured such a thing took days, not 90 minutes.

Weird.