Here's what happens when you drive a 12-ton bus across a 10-ton bridge

https://d2pvyxdw30n8fd.cloudfront.net/KY3/v5bc55ad79bb1b/SD.mp4
You can see this cute bridge in California sag ominously as a heavy bus passes over it. According to the person who shot the video, 'This is the 2nd bus to cross the 10-ton limit one-lane Beaver bridge.' I don't think the bridge can handle many more bus crossings like this.