The towns are small and easily identified by State Highway signs. The Metro Phoenix area is a major exception - you need a good road atlas to plan your route in the Valley of the Sun. This is the atlas I use for traversing Arizona. It is produced by Rand McNally and is a very good resource to keep handy. The Metro Phoenix area is growing by leaps and bounds and a good reference map is a must.
Book is spiral bound and has a map for overview of Phoenix Metro area.
Easy to use. I haven't used this atlas, however, it too is published by Rand McNally and they are a leader in map production. Though we've grown considerably since our early days, we maintain the same mission and commitment to our customers.