[dysfunction]

Streets may not have gotten wider in a given city/town since then, but there's been a lot of population growth and development in that time in the sunbelt where urban planning has favored very wide roads. So even if roads themselves aren't getting wider, people have been moving to places where roads are wide.

[twoWhlsGud]

This. I was recently in Phoenix for a meeting and was struck by the state of the roads there. Lots of paint on the roads bike lines on 4 or 6 lane 45 mph streets where lots of folks were doing 55+. I class myself as someone who will bike a lot of places in Seattle but I didn't see a single road (i'm sure there are some somewhere there) that I'd be willing to ride in Phoenix.