Objects in mirror are closer than they appear
Safety warning on convex mirrors / From Wikipedia, the free encyclopedia
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The phrase "objects in (the) mirror are closer than they appear" is a safety warning that is required[lower-alpha 1] to be engraved on passenger side mirrors of motor vehicles in many places such as the United States, Canada, Nepal, India, and South Korea. It is present because while these mirrors' convexity gives them a useful field of view, it also makes objects appear smaller. Since smaller-appearing objects seem further away than they actually are, a driver might make a maneuver such as a lane change assuming an adjacent vehicle is a safe distance behind, when in fact it is quite a bit closer.[1] The warning serves as a reminder to the driver of this potential problem.