My town, though much smaller, has its own "101" with similar bottlenecks. But there are now (at least) three bike bridges across it. While not free to build, th

My town, though much smaller, has its own "101" with similar bottlenecks. But there are now (at least) three bike bridges across it. While not free to build, they're doubtlessly much cheaper, especially since the bikes can use already existing neighborhood streets with minimal impact on the residents. I'm not sure there's a master plan for improving bike routes, but when they have to tear up a road for some reason, they usually design its replacement to accommodate bikes with dedicated lanes, bridges, tunnels, etc.