A travel control method for a vehicle, the method including detecting a surrounding situation of an own vehicle that travels autonomously and controlling a motion of the own vehicle based on the surrounding situation, comprising: determining whether a planned traveling route of the own vehicle includes another traveling lane different from a travelling lane, the own vehicle traveling autonomously in the traveling lane; when determining that the planned traveling route includes the other lane, determining whether traffic congestion is occurred in the other lane; when determining that the traffic congestion is occurred in the other lane, detecting, behind another vehicle in the other lane, a shape of an approach space which is present between a rear end of the other vehicle and a boundary line set at a branch from the traveling lane to the other lane; determining whether the shape of the approach space meets a predetermined condition, when determining that the shape of the approach space does not meet the predetermined condition, setting, along a lane direction of the other lane, a target posture of the own vehicle at the target position behind the other vehicle in the other lane; when determining that the shape of the approach space meets the predetermined condition, setting the target posture of the own vehicle at the target position behind the other vehicle in the other lane based on the shape of the approach space so that a protruding amount is equal to or less than a predetermined value, the protruding amount indicating an amount by which the own vehicle protrudes from the boundary line of the other lane; generating a target traveling trajectory from a current position of the own vehicle to the target position so that the own vehicle takes the target posture at the target position, and controlling the motion of the own vehicle so that the own vehicle tracks the target traveling trajectory. determining whether a planned traveling route of the own vehicle includes another traveling lane different from a travelling lane, the own vehicle traveling autonomously in the traveling lane; when determining that the planned traveling route includes the other lane, determining whether traffic congestion is occurred in the other lane; when determining that the traffic congestion is occurred in the other lane, detecting, behind another vehicle in the other lane, a shape of an approach space which is present between a rear end of the other vehicle and a boundary line set at a branch from the traveling lane to the other lane; determining whether the shape of the approach space meets a predetermined condition, when determining that the shape of the approach space does not meet the predetermined condition, setting, along a lane direction of the other lane, a target posture of the own vehicle at the target position behind the other vehicle in the other lane; when determining that the shape of the approach space meets the predetermined condition, setting the target posture of the own vehicle at the target position behind the other vehicle in the other lane based on the shape of the approach space so that a protruding amount is equal to or less than a predetermined value, the protruding amount indicating an amount by which the own vehicle protrudes from the boundary line of the other lane; generating a target traveling trajectory from a current position of the own vehicle to the target position so that the own vehicle takes the target posture at the target position, and controlling the motion of the own vehicle so that the own vehicle tracks the target traveling trajectory.