Patent Number: 7,788,031

Title: Routing assistance system

Abstract: When a rotary intersection is of large scale, "rotary intersection guidance based on exit number" is provided. That is, it is informed from what number exit road of the multiple exit roads of a rotary intersection, relative to an entrance road, the driver should get off. For example, the guidance of "Get off from the second exit road ahead" is provided. In contrast, when a rotary intersection is of small scale and the rotary intersection is in simple shape, "rotary intersection guidance based on direction guidance" is provided. That is, the direction of an exit road about which guidance is to be provided, relative to an entrance road, is informed. For example, the guidance of "Turn to the right" is provided.

Inventors: Mikame; Masami (Anjo, JP)

Assignee: DENSO CORPORATION

International Classification: G01C 21/30 (20060101)

Expiration Date: 8/31/12018