This is the footbridge across the high speed raillink.The small badge on the lhs tells all that the bridge is treated with Smartwater to inhibit theft.Who,in their right mind,is going to steal a bridge ?
You dont steal the bridge.
You unbolt and steal the panels of stainless steel, which are very valuable as scrap metal.
The people that made the bridge know that the panels could be stolen.
It is cheaper to put that little sign up than it is to weld the panels on so that they cannot be stolen.
Of course the panels will be stolen by someone that cannot read.