Google Map Maker became available for the United States this week. Formerly Google Map Maker was available for many other countries but not the United States.
Google Map Maker makes Google Maps more like a wiki, in the style of OpenStreetMap. This makes it possible for users to edit places, hours, roads, and buildings. It’s even possible to add bike lanes.
There is an approval process for changes, which considers input from other users.
This development will be useful for transit agencies that wish to fine-tune user experience for Google Transit by making local landmark and road information more accurate.
More information is available in a post on the Official Google Blog.