" As for technical glitches, Mr. Lieber says, "There is a range of systems out there, just as in every kind of product line, ranging from poor to mediocre to excellent."

Ask for help to weave the distance technique in the application, even can carry out the on-line upgrade of long range with a machine system.

In this paper, a linear referencing system based on road line-shape is presented in order to reduce spatial data redundancy and protect road event from going out of road range.