1. A method for generating an improved database representing a road network, comprising the steps of: defining a baseline road in the road network, the defining comprising replacing an original representation of the baseline road in the database with new data, the new data having a greater accuracy than the original representation; collecting the new data from a vehicle traveling a route in the road network; dividing the route into one or more route segments; assigning each route segment as an on-baseline segment, an off-baseline segment, an off-baseline to on-baseline transition, an on-baseline to off-baseline transition, or a within-baseline transition; processing the collected data for each route segment.