Can You Open Car Windows While Driving on the Highway?

[LeNoah]

It is possible to open car windows while driving on the highway, but it is recommended to open the rear windows for better ventilation. However, it is not advisable to keep them open for extended periods, nor is it recommended to open both side windows simultaneously. Doing so can create crosswinds inside and outside the vehicle, which can increase fuel consumption and negatively impact driving performance. Increased Fuel Consumption: At high speeds, a car's aerodynamic design minimizes wind resistance. However, opening windows disrupts the vehicle's structural integrity and its original streamlined shape, significantly increasing air resistance and, consequently, fuel consumption. In fact, the additional fuel consumption from open windows can exceed that of using the car's air conditioning. Generally, when driving at speeds above 80 km/h, using air conditioning is more fuel-efficient than opening windows. Risk of Vehicle Rollover in Crosswinds: During crosswind conditions, if both side windows are open, strong air currents can enter the vehicle. If these currents cannot be quickly expelled, they may exert a lateral force on the car body, potentially leading to a rollover in severe cases.