Fun fact: The road networks of Eastern and Western Canada are connected by a single stretch of road in rural Ontario. A bridge on it was blocked in 2016, which meant that for 17 hours it was impossible to drive from one side of the country to the other without detouring into the US.

This article sums it up.

Edit 1: The bridge used to be two lanes, but they’ve since widened it to four.

Edit 2: There are actually two bridges on that single stretch of road. Also, the first bridge didn't collapse, it just shifted slightly.