Fences on bridge overpasses?

Question

Why on some bridges are one side of the fencing straight and the other curved inward? I know on some it is curved in on both sides, but why would it only be on one side?

Answer 1

Ok some fences are straight because there cheaper than curved ones but offer less protection against suicide, falling etc. One side may be curved because it may have been damaged and replaced.

Answer 2

It is for tying to stop dropping or throwing of articles or objects from or upon any part of a lane, road, street, alley, bridge, or overpass and to create the Highway, Bridge, and Overpass Vandal Fence Fund.