Well, don't know if you noticed but there is a wall to right. lol.. i never thought of that.. but anyway, its just the way the tracks were laid out, but they do turn right on the road courses. Ok the answer of because the wall is on the right side makes no sense at all if they turn their cars the other way on the track the wall would be on the left. They turn left because the driver seat is on the left side of the car so their visablity is much greater on the left their visibility to the right is not that great. Just like if you your self are going around corners it is easier to turn to the left then the right because you are on the right.
It is for safety. Back in the day, when NASCAR was called "stock cars", the cars were based off cars produced for American streets. Cars designed for American streets have the steering wheel on the left. If cars went clockwise (turned right) the driver would be pinned against the wall, when they crashed in a turn. The old Riverside (California) road course had a long sweeping righthand turn with an outside wall. At full speed around that corner the drivers would be right against the wall.
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Because your heart is on your left side and turning left makes the forces go right, allowing the heart to pump blood to the right side of your body easily. Turning right all the time would make the heart have to pump faster to get blood to the right side of the body.