As a car travels around a roundabout, the characteristic that is constant is speed (assuming it maintains a uniform speed). However, since the direction of the car is continually changing as it moves around the curve, both velocity (which includes direction) and position are not constant.
So, if the question is asking for what remains constant, the correct answer would be speed. If it meant to identify the consistent factor regarding the roundabout, note that while speed can be constant, the velocity is not due to changing direction.
Therefore, the best answer is Speed.
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