Method and system for providing bicycle information with a navigation system

A navigation system feature that provides information about bicycle traffic and/or travel by bicycle. According to one aspect of the disclosed subject matter, a navigation system uses a geographic database to provide navigation-related features, such as route calculation and route guidance, for both motorized vehicles and bicycles. When providing navigation-related features for travel by bicycle, the navigation system evaluates the road segments for suitability for travel by bicycle. According to another aspect of the disclosed subject matter, a navigation system in a motorized vehicle provides warnings about bicycle traffic around the motorized vehicle as the motorized vehicle is being driven. Using a geographic database that includes data about the locations of bicycle lanes and paths, the navigation system provides warnings as the motorized vehicle approaches a bicycle lane or path or otherwise is in proximity to a bicycle lane or path. According to another aspect, information about bicycle lanes is included in a geographic database used by a navigation system. The geographic database includes data that represent roads used by motorized vehicles. The geographic database also includes data about bicycle lanes that are located adjacent to lanes of represented roads used by motorized vehicles. The geographic database also includes data about bicycle lanes that are located separately from lanes of roads used by motorized vehicles. According to another aspect, the navigation system receives transmissions from bicycles, motorcycles, or pedestrians located in a vicinity of the vehicle and provides warnings to the vehicle driver, as appropriate.