Running index algorithm, route planning method and navigation method

The invention discloses a running index algorithm. The running index algorithm comprises a section running index algorithm and a route running index algorithm, wherein the section running index algorithm comprises the following steps of: extracting a position code information set corresponding to a section from real-time dynamic traffic information; calculating distance weighting average speed of the section, wherein the distance weighting average speed of the section is an accumulated value of results of multiplying various position code speeds in the section by specific values of position code corresponding distances to the distance of the section; and calculating an average speed of the section according to the road property of the section, wherein the average speed of the section is obtained by carrying out integrated weighting on the distance weight average speed and the road property of the section. The running index algorithm also comprises the step of obtaining a drag-free index of the section according to a mapping relation of a drag-free index value and the average speed of the section. The route running index algorithm is obtained on the basis of the section running index algorithm. The algorithm can be used for precisely reflecting road condition information.