My bridge only ended up holding 54.4 lbs, and had an efficiency of 50.4%. My bridge weighed 108 grams.

There are many things that I could have done better in this. The weight was mainly put on the road bed. There was no limit to how many roadbeds we could have, or how thick they could be. So the bridges that had the thickest roadbed generally had the higher breaking load. For example, the bridge below had the highest efficiency, and was mostly a single road bed with very little structure.