Why are car steering wheels round?

Answer:

1. A steering wheel is round so that your hands locate in the same place regardless of the steering wheel’s orientation. 
2. While turning / steering the car it is ergonomically the best design. 
3. Also as design is circle, there are no edges to hit while turning / steering is moving as the circle position remains the same.
4. From Design view, it should be able to give uniform force i.e. torque, by varying the distance from center will vary the torque provided.