<http://schema.org/about>
"A transportation network is a complex thing. Millions of people walking, biking, and driving in all directions, brushing past each other in various weather and light conditions."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/bikes/bike-friendly-portland-had-zero-cyclist-fatalities-2013.html>