My wife grew up in an old, industrial town in Northern Illinois.  The Rock River forms the northern border of the town, and along its banks stretch several miles of steel mills and machine tool manufacturers.  Several bridges span the river, and serve as indispensible transportation routes to the industrial facilities.

Right now, one of the bridges is undergoing repairs.  The  bridge is open to traffic while the work goes on.  Personally, I think I'll use a different bridge next time I'm in town.