1. A method for representing lanes with a road database comprising: storing in the road database data representations of physical road lanes; associating with each data representation of a physical road lane data indicating start and end points of the represented physical road lane; and data indicating what physical features are adjacent to the represented physical road lane on a right side and a left side thereof; and associating with each data representation of a physical road lane data indicating a geometry of the represented physical road lane, wherein the geometry of a represented physical road lane includes a clothoid.