| 摘要 |
PURPOSE: To confirm its own current position accurately and easily by the driver of an automobile, etc. CONSTITUTION: A traffic sign, which is mounted along a road and in which a place name, etc., are coded and displayed, is read optically, map information recording is retrieved by using a read place-name code, and the current position of a travelling body is confirmed. Since an optical means is used, there is no possibility of interference such as electromagnetic waves, and the optical means can also be utilized in an urban area and a tunnel. A bar code may be employed as the code. Since the density of the installation and place of the installation of the traffic sign can be selected arbitrarily as required, not only the current position but also the destination of an actually necessary branch road and the addresses, etc., of public facilities and a hotel can be displayed. Since the traffice sign can be used jointly with a conventional one, the traffic sign is practical and economical. |
