There is at least one thing when sitting on the side is better for driving when you overtake another vehicle.
Sitting on the edge of the car at the center of the road results in you seeing longer past a vehicle in front of you. You alos need to expose less of the car to oncoming traffic before not traffic is blocked by the vehicle in front. It might not be that relevant if you overtake a car but if it is a truck it will block a lot ahead.
Sitting in the middle of the car gives you the same amount of visibility towards both sides but I am not sure that is a huge advantage. If you drive a car having better visibility on toward the center of the road is in my experience better. There is a lot more situation when you car what is on that side of the car directly beside, behind, or in front compared to the other side.
Regardless of the visibility, the main reason is what is mentioned in other posts, you fit two individuals in the front row of a car. There is one problem with this argument, trucks and other larger vehicles. They are also controlled from one side even when they are and have three sets side by side. Even on them sitting on one side give you good visibility on one side compared to a more equal on two sides. It might be a holdover from not as wide older trucks and cars but I do not think that is the case.
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