Driving assistance apparatus, vehicle, driving control method, and program

A program storage device, readable by machine, storing a program for driving a host vehicle in such a manner that an acceleration of said host vehicle is caused to become equal to a follow-up acceleration to make an inter vehicle distance between a preceding vehicle traveling ahead of said host vehicle and said host vehicle coincide with a target inter vehicle distance,

• said program causing a processor to implement processes of:
• a first step for setting said target inter vehicle distance to a large-size-vehicle inter vehicle distance when said preceding vehicle is a large-size vehicle, said large-size-vehicle inter vehicle distance for causing a traffic-signal-equipment-distance indicative of a distance to a traffic signal equipment having a predetermined height of a detection time point at which said traffic signal equipment is detected above said preceding vehicle in a camera image obtained by a camera device mounted on said host vehicle by taking a picture of a predetermined area ahead of said host vehicle to be longer than a stop-required-distance indicative of a distance for which said host vehicle travels until said host vehicle stops assuming that said host vehicle starts decelerating at a predetermined deceleration from said detection time point;
• and
• a second step for driving said host vehicle in such a manner that said acceleration of said host vehicle coincides with said follow-up acceleration.