Hello,
I've seen some old posting of people using semi flatbed trailers and flatbed rail cars are driveway bridges. Has anyone done a project like this recently in the midwest? Ideally somewhere in Indiana?
I've driven across a few. They make for a pretty darn nice bridge. The semi trailer ones will be much easier to accomplish on a budget. The most important part is to properly support the headwalls. Some 2x2x6' concrete blocks work great for this.