I created a KML file with California state highway traffic count data from 2007, for use with Google Earth.

A map of all Interstate highways I have driven on:


Half Dome, Yosemite National Park, September 2009.

Great Smoky Mountains, September 2010.

Delicate Arch, Arches National Park, September 2010.

Angels Landing, Zion National Park, September 2010.

Ryan Mountain, Joshua Tree National Park, June 2011.