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"Sport" suspensions will do that. My Ridgeline is a 3/4-ton truck, so it's suspension is fairly stiff as well and we tend to feel most of the bumps at lower speeds. 60 miles an hour will smooth things out regardless of what you're driving.My wife's Infiniti M45 Sport has those low profile tires to go along with the sport suspension. At 20 mph, you feel ever bump in the road. At 60, you can't feel a thing, it's smooth as glass.