Is the World Ready For a Car Without a Rear Window?
Published on 2026-04-25T20:19:00Z
There's a glass roof — but no rear-view window. Instead the Polestar 4 replaces the rear-view mirror with a live feed from a wide-angle camera. Its high-resolution display (1480 x 320 pixels) promises "a panoramic view of the outside," according to Polestar's web site, showing more of what's behind you. "Visibility in the dark and in rainy conditions is also vastly improved." Besides the camera feed (and side mirrors), the Polestar 4 offers four short-range cameras (for 360-degree views), and even short-range ultrasonics, the Wall Street Journal points out. (Car rear-view windows are usually five feet off the ground, "making a typical traffic cone invisible from closer than about 35 feet." ) And this new design also improves "aero efficiency," reducing drag and shearing turbulence, "critical, since the Polestar 4 is all-electric, and aero drag is the mortal enemy of range." [A]s a practical matter, the Polestar 4's innovation only acknowledges what drivers already know. In many modern cars, the rearview mirror is all but useless, anyway. In a typical full-size SUV, the glass in the rear hatch is about 10 feet away from the rearview mirror, with two sets of headrests in between... Having spent a few days in what Polestar calls an "SUV coupe" I am here to report that drivers won't miss the mirror. For one thing, the display is shaped like a conventional mirror, imbuing it with the comfort of the familiar. The imagery is convincingly mirror-like — reversed — with eye-like focal length, decent resolution and lowlight sensitivity, making it easy to trust when judging distances, with the help of graphical overlays and warning tones. It also has excellent auto-dimming algorithms.... The Polestar 4 is called that because it is the fourth model from the Swedish-Chinese premium/luxury collab, born out of Volvo Cars' performance subbrand. Describing it as an "SUV coupe" almost feels like a translation error. The design eschews signaling traditional utility in favor of a jocund modernism — call it orbital chic.... As for missing the rear window, my advice is, don't look back. "In sports cars, rearview mirrors have been essentially decorative for some time," the article points out. (The 1974 Lamborghini Countach LP400 originally envisioned "a rear-facing periscope fitted in a dorsal channel in the roof.") "The era's contempt for rearview mirrors was captured in a scene from The Gumball Rally (1976) when Raul Julia's character snaps the mirror off his Ferrari Daytona and throws it away. 'The first rule of Italian driving,' he says. 'What's behind me is not important.'" There's 11 exterior cameras, plus 12 ultrasonic sensors and a mid-range radar to watch for threats and "intervene if necessary". One feature even reads speed limit signs and shows the posted limit on the driver's display. ("If the car exceeds the limit, the driver will hear a warning sound.") Even the windshield has built-in camera sensors to provide automatically "adaptive" headlights that switch from high beam to low beam when they identify approaching vehicles or the taillights of cars ahead. "A total of seven airbags are deployed in the event of a collision." Thanks to Slashdot reader fjo3 for sharing the article.
Published on 2026-04-25T20:19:00Z
There's a glass roof — but no rear-view window. Instead the Polestar 4 replaces the rear-view mirror with a live feed from a wide-angle camera. Its high-resolution display (1480 x 320 pixels) promises "a panoramic view of the outside," according to Polestar's web site, showing more of what's behind you. "Visibility in the dark and in rainy conditions is also vastly improved." Besides the camera feed (and side mirrors), the Polestar 4 offers four short-range cameras (for 360-degree views), and even short-range ultrasonics, the Wall Street Journal points out. (Car rear-view windows are usually five feet off the ground, "making a typical traffic cone invisible from closer than about 35 feet." ) And this new design also improves "aero efficiency," reducing drag and shearing turbulence, "critical, since the Polestar 4 is all-electric, and aero drag is the mortal enemy of range." [A]s a practical matter, the Polestar 4's innovation only acknowledges what drivers already know. In many modern cars, the rearview mirror is all but useless, anyway. In a typical full-size SUV, the glass in the rear hatch is about 10 feet away from the rearview mirror, with two sets of headrests in between... Having spent a few days in what Polestar calls an "SUV coupe" I am here to report that drivers won't miss the mirror. For one thing, the display is shaped like a conventional mirror, imbuing it with the comfort of the familiar. The imagery is convincingly mirror-like — reversed — with eye-like focal length, decent resolution and lowlight sensitivity, making it easy to trust when judging distances, with the help of graphical overlays and warning tones. It also has excellent auto-dimming algorithms.... The Polestar 4 is called that because it is the fourth model from the Swedish-Chinese premium/luxury collab, born out of Volvo Cars' performance subbrand. Describing it as an "SUV coupe" almost feels like a translation error. The design eschews signaling traditional utility in favor of a jocund modernism — call it orbital chic.... As for missing the rear window, my advice is, don't look back. "In sports cars, rearview mirrors have been essentially decorative for some time," the article points out. (The 1974 Lamborghini Countach LP400 originally envisioned "a rear-facing periscope fitted in a dorsal channel in the roof.") "The era's contempt for rearview mirrors was captured in a scene from The Gumball Rally (1976) when Raul Julia's character snaps the mirror off his Ferrari Daytona and throws it away. 'The first rule of Italian driving,' he says. 'What's behind me is not important.'" There's 11 exterior cameras, plus 12 ultrasonic sensors and a mid-range radar to watch for threats and "intervene if necessary". One feature even reads speed limit signs and shows the posted limit on the driver's display. ("If the car exceeds the limit, the driver will hear a warning sound.") Even the windshield has built-in camera sensors to provide automatically "adaptive" headlights that switch from high beam to low beam when they identify approaching vehicles or the taillights of cars ahead. "A total of seven airbags are deployed in the event of a collision." Thanks to Slashdot reader fjo3 for sharing the article.
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