Why do you think a car could not create a vacuum quickly? Airbags deploy quickly. Seatbelts tighten quickly. An emergency vacuum could use three parts: a depl

Why do you think a car could not create a vacuum quickly? Airbags deploy quickly. Seatbelts tighten quickly. An emergency vacuum could use three parts: a deployable skirt, a device to create the initial low-pressure, and a fan to maintain it. The speed limitation is the speed of sound (340m/s), which takes only 1 millisecond to propagate through 1m of distance from the car to the ground.