There were a lot of mistakes in designing this bridge, a lot of tension and compression mishaps. But in the end, I'm quite satisfied with the way it works and looks. I had originally intended on making an arch bridge, but I had difficulty finding which type of metal to used, tubes and so forth so I stayed away from arches at the beginning of this process. There were many designs that worked, but none below 220k. I tried several square bridges, and diamond-shaped interior bridges, but none seems to work as well as the design I ended up with. After playing around with different slenderness, sizes, lengths, etc. I found just what I wanted for the project. It's not the best I could make it, but trying to down-size it even more was the most difficult part about making this bridge in the first place.
Reflection
Here you can see that the truck successfully made it across the bridge.