This is a map of Interstate 15 in California, with unconstructed parts in purple.
<a href="//commons.wikimedia.org/wiki/User:NE2" title="User:NE2">User:NE2</a>
<a href="//commons.wikimedia.org/wiki/Special:EmailUser/NE2" title="Special:EmailUser/NE2">Email me</a> if you would like a copy of the GIS data I created for the highways.