A vehicle driving assist system is provided that increases an actuation reaction force exerted by the accelerator pedal, when it is operated, as a risk potential with respect to a preceding obstacle increases. The system also lowers the driving force and increases the braking force exerted against the host vehicle as the risk potential increases. During braking/driving force control based on the risk potential, the system changes a braking/driving force control operating schedule in accordance with the driver's intentions with respect to accelerate or decelerate.