: 工n order to make safe and efficient . au 七〇mobile trarafic , ANSA { Aute Navigation System for Automobiles ) is stud ±ed 。 ANSA is a computer system mainly showing the driver of an automobi !e a suitab ユe rou 七e to des しination on a CRT display . 工n this report , basic experiments and studies of software of ANSA are described . At firstt check points of ANSA are shown and data strUcture of road ne 七works is described . The data structure of road networks in this report 二 is a poin 辷er type

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... is c 。 mp 。 sed of s ・me levels c 。 ntaining highways , ne ・ti 。 nal r 。 ads ・ 1。 cal r 。 adst and so on . At la $ t da ヒa of roads are inputted in a cemputer and it5 results are described . 1