The fusing algorithm of link speed based on floating vehicles equipped with GPS

This paper focused on the estimation of link speed, one of the basic parameters indicated the road traffic status. Considering weak performance of the traditional fixed link speed detection, the floating vehicles equipped with GPS were taken as the probe instruments. An estimation algorithm of link speed was proposed by the fusion of the position data from floating vehicles and the node information from every road section on electronic maps. In the estimation algorithm, the position data on road sections from floating vehicles were formed a discrete time series ordered by time. Moreover, the time in which single floating vehicle passed the given road section can be estimated with the road section information on the electronic maps after linearization process. On the basis, the link speed can also be calculated. The experimental results show that the presented algorithm of the road traffic status detection is valid and effective.