Travel assistance device

A travel assistance device, comprising:

• a processor to execute a program;
• and
• a memory to store the program which, when executed by the processor, performs processes of,
• acquiring traffic lane connection information which expresses a connection relationship of roads in units of traffic lanes by a plurality of traffic lane nodes and a plurality of traffic lane links connecting each of the plurality of traffic lane nodes and does not include a coordinate of a traffic lane link shape point constituting each of the plurality of traffic lane links and first traffic lane reference information which expresses a connection relationship of roads in units of traffic lanes by the plurality of traffic lane nodes and the plurality of traffic lane links and includes a coordinate of a traffic lane link shape point constituting each of the plurality of traffic lane links,
• searching a travel route of a vehicle using the traffic lane connection information;
• acquiring the first traffic lane reference information of a traffic lane necessary to perform a leading guidance of the travel route based on the traffic lane connection information of the travel route;
• and
• creating guidance information for guiding the vehicle using the acquired first traffic lane reference information.

A travel assistance device, comprising:

• acquiring second traffic lane reference information which has each of connection information indicating a connection relationship of roads in units of traffic lanes by a plurality of traffic lane nodes and a plurality of traffic lane links connecting each of the plurality of traffic lane nodes and shape information including a coordinate of a traffic lane link shape point constituting each of the plurality of traffic lane links and indicating a shape of traffic lanes in a different data frame;
• searching a travel route of a vehicle using the connection information of the second traffic lane reference information;
• acquiring the shape information of the travel route from the second traffic lane reference information;
• and
• creating guidance information for guiding the vehicle to the travel route using the connection information and the shape information of the travel route.