TRAVEL ASSISTANCE METHOD AND TRAVEL ASSISTANCE DEVICE

A travel assistance method selects a merging destination vehicle that will travel in front or behind a host vehicle 1 when the host vehicle 1 merges into an adjacent lane L2, based on a history of whether other vehicles (2a to 2f) traveling in the adjacent lane L2 allowed merging of a first preceding vehicle 2d traveling in front of the host vehicle on a host lane L1 and locations of the other vehicles (2a to 2f) traveling in the adjacent lane L2 in a lane direction within a section Pmer in which the merging into the adjacent lane L2 from the host lane L1 is possible.