Why does a car feel floaty at high speeds?

[LeReid]

Reasons why a car feels floaty at high speeds: There is a significant change in lateral airflow forces. For example, when overtaking at high speed, a small car and a large vehicle overtaking side by side will make the small car feel more floaty. This is because when overtaking, the airflow channel between the two vehicles narrows, the flow velocity increases, and the air pressure decreases, creating suction. During high-speed driving, the car needs to break through the air resistance barrier in front. The dispersed air flows relatively over various surfaces of the car body. When passing surfaces of different shapes, since the volume of air flowing is equal, the airflow speed above the car will be greater than that below the car. The pressure difference between the air above and below the car creates a certain "lift force," which reduces the tire grip and thus decreases the stability of the car at high speeds.