Air resistance is the resistance offered by air molecules as an object, such as a car, moves through them. There are a number of factors that affect air resistance. These include the shape of the car, the surface finish and the car's speed.
The air resistance of a car can be reduced by providing lesser surface area that encounters air and providing smoother surfaces. To do this, we can make cars wedge-shaped and keep their heights very low (the car should be as close to the ground as possible). All the corners can be rounded and provided a smoother finish. This is exactly what is done with sports cars; you may want to check out the cars in Formula 1 racing.
We can also keep the surfaces smooth by painting them with smooth, friction-reducing paint coats.
The lesser the number of corners that air encounters, the lesser the air resistance.
Note that lower air resistance is preferred in consumer vehicles to improve fuel efficiency.
Hope this helps.
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