streetcars

Yesterday I mentioned sewer systems as an indispensable part of urban infrastructure, and today I want to focus on the more visible issue of transportation. The efficiency with which people and goods move into and within cities has a huge impact on both energy use and air quality. And the availability of non-driving modes of transportation can improve people's lives in a lot of ways. I read a few blogs that address transportation issues (Greater Greater Washington is indispensible for DC-area transportation nerds), and I'd like to address an assumption that I see a lot of commenters making:…