Patent ID: 8332138

Claim:
A road information acquisition device comprising: a surface elevation acquisition unit that obtains a surface elevation; a road information acquisition unit that calculates a first road information relating to a subject coordinate point of a travel route to be traveled by a host vehicle on the basis of the surface elevation; a structure determination unit that determines whether or not a structure exists on the travel route; a database installed in the host vehicle, the database having road elevation data stored therein, the road elevation data is used as a second road information, the second road information relates to the subject coordinate point at which the structure exists on the travel route, the second road information is different from the first road information; and a road information learning unit; wherein, when the structure determination unit determines that the structure exists on the travel route, the road information acquisition unit obtains the second road information, and the road information acquisition unit does not calculate the first road information as information relating to the subject coordinate point at which the structure exists on the travel route, and the structure determination unit determines whether or not road elevation data relating to the subject coordinate point at which the structure exists is stored in the database, and when the road elevation data exists in the database the road information acquisition unit obtains the road elevation data as the second road information; wherein the road information learning unit learns the second road information relating to the travel route on which the structure exists as the host vehicle travels the travel route.