An accuracy analysis for horizontal alignment of road by the kinematic GPS/GLONASS combination

Many of the traffic accidents on roads are a result of alignment defects in the roads. Therefore, it is very important to deter mine alignments, and correct the elements of the alignments that do not meet design requirements. This will insure that cars run on the roads safely. In order to determine the correct alignment of roads, a three-dimensional trajectory of the center line shall be acquired as data. Although there will be various methods, we can do that easily with GPS. Additionally, it is very convenient to use, because it acquires the same data for interpreting positions, as car navigation system. Although we can acquire data from a three-dimensional trajectory of a center line using GPS, it will be more accurate if it is based on a combination of GPS/GLONASS. Accordingly, in this study, the precision based on traditional design drawings was compared with the data acquired with the combination of GPS and GLONASS. We would like to propose an effective and useful approach to utilize the satellite road alignment system by evaluating the existing roads horizontal alignment.