Data preparation model based on hierarchical road network and its implementation

To reduce the communication time,we proposed a data preparation model named transportation meshes set circum-rectangle(TMSCR).This modal stated that traffic center should send a special data set to vehicles,which consisted of the low level road segments in O-grid and D-grid as well as high level road segments in the circum-rectangle of meshes set which contained O-node and D-node.Experiments indicate that the implementation process is much more efficient in a personal computer.The model will greatly contribute to time savings in the communication between traffic center and vehicles so that provide better service level to vehicles compared with traditional method.