TRAVEL ASSISTANCE METHOD AND TRAVEL ASSISTANCE DEVICE

A travel assistance method in one aspect of the present invention is the method for assisting traveling of a host vehicle using a determined route and vehicle speed. The method includes: detecting an obstacle in an adjacent lane of a travel lane in which the host vehicle travels; setting a travel range on a side of the obstacle on the host vehicle side when the obstacle is detected; setting at least one of the route and the vehicle speed such that the host vehicle does not obstruct advancing of another vehicle traveling in the adjacent lane toward the obstacle in the travel range; and executing travel assistance using the set route and/or vehicle speed.