Google has come up with an easy alternative for visually impaired users at Google Maps. It uses Textual Maps UI which makes the task for a visually impaired searcher or for one who is not using non-graphical display easy. You can "just type a simple English query of the form start address to end address and quickly get the information you're looking for."
Google Research Scientist, T.V. Raman says at the Google Blog that:
Though we added this option to enhance the accessibility of Google Maps for blind and low-vision users, perhaps others will find this alternative view a useful addition to their maps arsenal.