One thing to consider is that larger objects take up more total space in your field of view. When you cast your gaze into any finite space, your brain processes what you’re seeing in an arrangement of objects, and uses monocular (perceptible with just one eye) and binocular (effects when observed with two eyes) cues to process depth perception and motion. If you perceive two objects in the distance which you believe are an equal distance away but different sizes, it could appear that the smaller of the objects is traveling faster because it moves position more dramatically within your field of view, due in part to its relation to background objects.
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