These are some sites I've collected over the years, if you have any you want to add email me.

Alabama Department of Transportation

AARoads

Historical Maps of Alabama State Roads

Kennessippi Roads

U.S. Highways: From US 1 to (US 830)

Alabama Routes

Magnolia Meaderings

Kurumi.com This site has a sign maker, must look.

Gribble Nation Alabama Road Photo Gallery

Dan Cole's Highway Pages

Alabama Photo Gallery -- Chris Patriarca

Vintage Alabama Signs

Northeast Alabama Highways