KS4401-07 is one side of a road or rail bridge that can span two lines or a road. The bridge side is made up of three pieces, the main arch ( spandrel ) and two buttresses. Then there are two wing walls. These come cut at 90° but you can trim them to have angle walls, see pictures for example.

There is an additional kit you can add which has the wing walls with the opposite angle and walls and buttresses to run the fall length along the top. KS44-01-03A

We had added additional strengthening corners to the base of the wings.