For broader coverage of this topic, see Wing mirror.
The phrase "objects in (the) mirror are closer than they appear" is a safety warning that is required[a] 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 farther 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.
In popular culture
Despite its origin as a utilitarian safety warning, the phrase has become a well known catch phrase that has been used for many other purposes. These include books,[2] films (including non-English ones),[b] cartoons,[c] songs,[d] music albums,[e] and other contexts.[f]
Pedestrian safety through vehicle design – prevention and reduction of injuries in the event of a collision between pedestrians and passenger cars.Pages displaying wikidata descriptions as a fallback
Rear-view mirror – Mirror in vehicles that allows the driver to see rearwards
Road traffic safety – Methods and measures for reducing the risk of death and injury on roads
Mind the gap – Warning to train passengers boarding and disembarking, another safety warning used at various London Underground stations that has also become a well-known catchphrase.
Notes
^For example, in the US, Part 571 - Federal Motor Vehicle Safety Standards, Section 571.111 S5.4.2. Retrieved 8 March 2023. "Each convex mirror shall have permanently and indelibly marked at the lower edge of the mirror's reflective surface, in letters not less than 4.8 mm nor more than 6.4 mm high the words 'Objects in Mirror Are Closer Than They Appear.'"
^Probably the most famous instance in pop culture was showing the approach of a Tyrannosaurus rex in the 1993 film Jurassic Park, which was parodied in Toy Story 2. In the 1980s, Gary Larson, in his syndicated cartoon series The Far Side, published a cartoon showing a rear view mirror inscribed with the warning, filled with a giant eye.
^"Subjects in the mirror are more far than they appear" the title of experimental visual project by Hungarian director/production designer Pater Sparrow.