The curvature of the Earth's surface is roughly 8 inches per mile (20 centimeters per kilometer) squared, which means that over a distance of 1 mile (1.6 kilometers), the surface of the Earth drops approximately 8 inches (20 centimeters) from a straight line.

Assuming that the car's length is measured from the front to the back bumper, the length of the car required to touch the ground in the middle due to the curvature of the Earth would depend on the radius of the Earth and the height of the car.

Assuming the car is 6 feet (1.83 meters) tall, and the radius of the Earth is approximately 3,959 miles (6,371 kilometers), we can calculate the length of the car required to touch the ground in the middle as follows:

The drop in height due to curvature over a distance of 1 mile is 8 inches.
The drop in height due to curvature over a distance of x miles is 6 feet (1.83 meters).
Therefore, x = (6 feet) / (8 inches per mile) = 0.75 miles.
The length of the car required to touch the ground in the middle is then approximately 0.75 miles (1.2 kilometers) long.
Note that this is a rough estimate and does not take into account factors such as the shape of the car, the height of the car above the ground, and variations in the curvature of the Earth's surface.
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