Personally it’s crossing the freeway where I live. My city has about 100,000 people but only six roads cross the freeway, with three more wayyy on the outskirts that are basically detours. There are also only a few pedestrian bridges that cross it, and zero pedestrian tunnels. The way our freeway works is it goes around downtown with the ocean to the south and west, so people live on the outside of the freeway and then commute inwards. This means insane bottlenecks with miles of cars in both directions trying to get to the other side. It doesn’t help that our four freeway entrances are also at some of these tunnels / bridges, which means people who need to get on or off the freeway are also present. In general it’s a shitshow and I’d really like to see a few more bypasses to prevent this congestion in the future.
i live in a majority sfh zoned streetcar suburb, however the area is majority walkable and not too awful for biking as a confident adult because of the grid roads for the walkable portion.
however, we are surrounded on all sides outside of this pocket of grid streets by poorly zoned sfh dominated by no sidewalk cul de sacs and 4 lane stroads with painted door zone bike lanes. the most notable areas are anywhere particularly north (rich people so literally no sidewalk) and near freeway interchanges. our south freeway interchange is the worst of them because its very stroady and has an auto dealership next to it. the others dont even try to pretend theyre not highway interchanges.