road map

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A map, especially one for motorists, showing and designating the roads of a region.
• noun A set of guidelines, instructions, plans, or explanations.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A map with a visual representation of roads used for automobile travel and navigation. A road map may contain other relevant data, such as terrain or rail roads.
• noun figuratively a plan of action, laying out the future actions of participants.
• noun computing A structured representation of objects over a period of time to display a development plan. Road maps are used in business for strategic planning and communications.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a map showing roads (for automobile travel)
• noun a detailed plan or explanation to guide you in setting standards or determining a course of action