Why do cars have two wipers?

Cars are equipped with two windshield wipers mainly to meet the cleaning needs of the front and rear windshields under different driving conditions. The necessity of a rear wiper depends on the vehicle design: sedans (three-box cars) typically do not require a rear wiper as the airflow generated by their streamlined bodies naturally cleans the rear window; whereas hatchbacks, SUVs, and station wagons, with their vertical rear designs that create airflow vortices, tend to accumulate dust and rainwater, thus requiring rear wipers to maintain rear visibility. This design variation demonstrates engineers' balanced consideration of aerodynamics and practicality, ensuring safe driving across different vehicle types in various weather conditions. Additionally, proper wiper maintenance is essential-avoid dry operation or aggressive removal of stubborn debris to prolong their service life.