Back in the early days of email, before Facebook and Buzzfeed, people used to send jokes around as chain messages. "Forwards" we sometimes called them. My favorite of these forwards was "Ways to Confuse Your Roommate" (here's a version of it). My favorite way: "Go to the gym. Use the multipurpose room. For just one purpose."
I've often thought about streets the same way. We usually use them for just one purpose, especially in California. And yet, no one is ever baffled.
The complete streets movement is changing this attitude. As most planners know, complete streets have been gaining popularity for the past few years, as the infrastructural equivalent of smart growth. Inspired by the Dutch woonerf and, before that, by the simple reality of multi-use, pre-automobile streets, complete streets seek to accommodate a diverse array of transportation modes all in the same space. The movement contends that feet and cars can peacefully coexist, and that streets can be places that people inhabit rather than pass through.