Vehicle control system, vehicle control method, and storage medium

A non-transitory computer-readable storage medium that stores an in-vehicle control program to be executed by an in-vehicle computer to perform at least:

• acquire as an index value relating to easiness of merging of a subject vehicle and an ease of merging of an other vehicle which is evaluated based on at least one of vehicle information relating to an operation of the other vehicle that has advanced from a merging lane to a main lane before the subject vehicle and external system information acquired near a merging point using the other vehicle in a case in which the subject vehicle is running in the merging lane merging into the main lane;
• execute automated driving of the subject vehicle on the basis of the acquired index value, and
• wherein, in a case in which there is no other vehicle that has advanced from the merging lane to the main lane within a predetermined time, acquire the index value relating to the easiness of merging based on at least one of the vehicle information relating to the operation of the other vehicle having the same date, time frame, or day of week of merging and the external system information acquired near the merging point using the other vehicle.