A characteristic is set to a first transmission force characteristic. A sensitivity is set to a first sensitivity. The maximum value of the square of a product of a value representing the first transmission force characteristic and a value representing the first sensitivity in a predetermined frequency range preset so as to include a frequency at which the value representing the first transmission force characteristic takes a peak value is set to an evaluation indication value. A complex spring constant in the vehicle longitudinal direction of the rear wheel suspension is set so that the evaluation indication value takes the minimum value out of values in a variable range of the evaluation indication value.

A characteristic relating to transmission of a longitudinal force input to a front wheel from the front wheel to a vehicle body is set to a first transmission force characteristic. A sensitivity of the vehicle to the longitudinal force transmitted from the front wheel to the vehicle body is set to first sensitivity. The maximum value of the square of a product of a value representing the first transmission force characteristic and a value representing the first sensitivity in a predetermined frequency range preset so as to include a frequency at which the value representing the first transmission force characteristic takes a peak value is set to an evaluation indication value. A complex spring constant in the vehicle longitudinal direction of the rear wheel suspension is set so that the evaluation indication value takes the minimum value out of values in a variable range of the evaluation indication value.

A system and method for using road preview to temporarily adjust height for an approaching obstacle includes receiving road preview data detected by a sensor system of a vehicle, the road preview data indicating an anomaly in a path of the vehicle. Here, the anomaly is disposed above a top surface of the path of the vehicle. The system and method also include estimating, based on the road preview data indicating the anomaly, attributes of the anomaly and determining, based on a velocity of the vehicle, a distance between the vehicle and the anomaly, and the attributes of the anomaly, whether a projected impact with the anomaly exceeds a vehicle travel threshold, and when the projected impact with the anomaly exceeds the vehicle travel threshold, raising the suspension of the vehicle from an initial height to a target height.