What Companies provide the driving information to the various map sites?

Someone must drive the roads in order to supply the specific inrformation that is provided by the various map sites. The information that I am refering to are items such as No left turns; One way streets; Crossing under a bridge; "U" turns; Restaurants; Gas stations; etc. This is the information that cannot be found on a street guide, highway map, or satellite image. Some company or companies must have people travel around and provide this information. What are the names of these companies?What Companies provide the driving information to the various map sites?Wow, good question. Here's a link that tells you more than you probably want to know:



http://www.gpsinformation.org/dale/mapma鈥?/a>



TomTom uses TeleAtlas, Garmin does it in-house apparently.



Hope this helps!