Essentially, you want to create a database of road networks (or
whatever) and then render them into a custom tile layer for display.
Here's an example of that (not with roads):

http://www.usnaviguide.com/zip.htm

Note how the details change as you zoom in (select hybrid zips for
this example).

Custom tile layers are constructed from a series of images called
"tiles" that are 256x256 pixels each on a side.

Here's a detailed explanation of what a custom tile layer is and how
it can be used:

http://www.youtube.com/watch?v=IYqfT9i1las

There's also a presentation and download of all the source, data and
other materials:

http://www.usnaviguide.com/ws-2008-02

-John Coryat

http://maps.huge.info

http://www.usnaviguide.com
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