Vehicle drive assist device, vehicle drive assist method, and non-transitory storage medium

A non-transitory storage medium storing instructions that are executable by one or more electronic control units and that cause the one or more electronic control units to execute functions comprising:

• setting a collision index value that becomes smaller as a possibility that a host vehicle collides against an object ahead of the host vehicle becomes higher;
• determining whether an object recognition condition meets a predetermined condition based on a state of an operation of an operator of the host vehicle by a driver of the host vehicle, the predetermined condition meaning that the driver recognizes presence of the object;
• executing warning control for warning the driver when the collision index value is smaller than a first index value;
• executing deceleration control for decelerating the host vehicle when the collision index value is smaller than a second index value that is smaller than the first index value and it is determined that the object recognition condition does not meet the predetermined condition;
• and
• disabling execution of the deceleration control when the collision index value is smaller than the second index value and it is determined that the object recognition condition meets the predetermined condition.

A vehicle drive assist method comprising:

• setting a collision index value that becomes smaller as a possibility that a host vehicle collides against an object ahead of the host vehicle becomes higher;
• determining whether an object recognition condition meets a predetermined condition based on a state of an operation of an operator of the host vehicle by a driver of the host vehicle, the predetermined condition meaning that the driver recognizes presence of the object;
• executing warning control for warning the driver when the collision index value is smaller than a first index value;
• executing deceleration control for decelerating the host vehicle when the collision index value is smaller than a second index value that is smaller than the first index value and it is determined that the object recognition condition does not meet the predetermined condition;
• and
• disabling execution of the deceleration control when the collision index value is smaller than the second index value and it is determined that the object recognition condition meets the predetermined condition.