A travel control method executed by a travel control apparatus, the travel control apparatus comprising: a control device; a first detector configured to detect a first obstacle around a subject vehicle travelling in a first lane; a second detector configured to detect second obstacles and a vehicle in a second lane adjacent to the first lane; and sensors configured to detect third obstacles in a third lane next to and adjacent to the second lane, the travel control method comprising: setting a first range at a target position for lane change in the second lane, the first range having a size equal to or larger than a size which the subject vehicle occupies on a road surface; detecting a range in the second lane as a second range, the second range in the second lane being located at a side of the subject vehicle, said second obstacles being absent in the second range in the second lane; and detecting a range in the third lane as a third range, the third range in the third lane being located at the side of said vehicle in the second lane, said third obstacles being absent in the third range in the third lane; and performing a correction to reduce the first range or increase the second range when the third range has a size equal to or larger than a predetermined range as compared with when the third range has a size smaller than the predetermined range; permitting the subject vehicle to change lanes when the second range completely includes the first range. a control device; a first detector configured to detect a first obstacle around a subject vehicle travelling in a first lane; a second detector configured to detect second obstacles and a vehicle in a second lane adjacent to the first lane; and sensors configured to detect third obstacles in a third lane next to and adjacent to the second lane, the travel control method comprising: setting a first range at a target position for lane change in the second lane, the first range having a size equal to or larger than a size which the subject vehicle occupies on a road surface; detecting a range in the second lane as a second range, the second range in the second lane being located at a side of the subject vehicle, said second obstacles being absent in the second range in the second lane; and detecting a range in the third lane as a third range, the third range in the third lane being located at the side of said vehicle in the second lane, said third obstacles being absent in the third range in the third lane; and performing a correction to reduce the first range or increase the second range when the third range has a size equal to or larger than a predetermined range as compared with when the third range has a size smaller than the predetermined range; permitting the subject vehicle to change lanes when the second range completely includes the first range. setting a first range at a target position for lane change in the second lane, the first range having a size equal to or larger than a size which the subject vehicle occupies on a road surface; detecting a range in the second lane as a second range, the second range in the second lane being located at a side of the subject vehicle, said second obstacles being absent in the second range in the second lane; and detecting a range in the third lane as a third range, the third range in the third lane being located at the side of said vehicle in the second lane, said third obstacles being absent in the third range in the third lane; and performing a correction to reduce the first range or increase the second range when the third range has a size equal to or larger than a predetermined range as compared with when the third range has a size smaller than the predetermined range; permitting the subject vehicle to change lanes when the second range completely includes the first range.