Why Do Hatchbacks Have Rear Wipers?

[StSimon]

Hatchbacks have rear wipers because: Due to the influence of vortices, the rear windshield of hatchbacks (also known as two-box cars) is more prone to forming greater negative pressure compared to the rear windshield of sedans (three-box cars). This makes it easier for dust and dirt to accumulate on the rear windshield, obstructing the rearview function. Therefore, hatchbacks are generally equipped with rear wipers to maintain a clear rearward view. When a car is in motion, it displaces an equivalent volume of air. Due to the viscous nature of fluids, the air cannot quickly fill the space vacated by the moving car, resulting in a vacuum at the rear of the vehicle and the formation of vortices.