Our perception of the speed of an approaching object is primarily based on:

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Quizplus · Accepted Answer

The rate of expansion of the object's image on our retina, also known as the optical flow, is the primary cue for perceiving the speed of an approaching object. As the object gets closer, its image on our retina expands and this expansion rate gives us an indication of the object's speed. Other cues such as texture gradient and aerial perspective may provide additional information but they are not as reliable in determining the speed of an approaching object. Binocular disparity and the law of good continuation are not relevant for perceiving speed.

Our Perception of the Speed of an Approaching Object Is