Driving support device for vehicle, driving support method for vehicle, and non-transitory storage media

A driving support device for a vehicle, the driving support device comprising:

• a front camera configured to acquire image data by capturing an image of a scene in front of the vehicle;
• and
• an electronic control unit (ECU) configured to execute driving support control for supporting driving by a driver of the vehicle when the ECU determines that a specific display object exists in front of the vehicle based on the acquired image data, the driving support control being executed depending on the specific display object, wherein the ECU is configured to determine a maximum speed indicated by the specific display object, determine an excess speed comprising an amount by which a speed of the vehicle exceeds the maximum speed,
• upon determination that the excess speed is less than a first predetermined threshold amount, execute a first level of driving support control comprising displaying content of the specific display object,
• upon determination that the excess speed is between the first predetermined threshold amount and a second predetermined threshold amount, execute a second level of driving support control comprising displaying the content of the specific display object and outputting a warning sound, and
• upon determination that the excess speed is greater than the second predetermined threshold amount, execute a third level of driving support control comprising displaying the content of the specific display object, outputting the warning sound, and decelerating the vehicle.