When you look out the window of a moving car, you see trees passing very quickly. However, when you look straight ahead, the trees appear to be moving much more slowly. This phenomenon is known as

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Motion parallax is a depth cue that results from the relative motion of objects as an observer moves. Objects closer to the observer appear to move faster than those further away, which explains the difference in perceived speed when looking out the side versus straight ahead.

When You Look Out the Window of a Moving Car