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This is a rear-facing camera.
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You’re only looking at it because something significant occurred after he changed lanes. IOW, a driver should be aware of what’s around him at all times but shouldn’t be focusing on what’s behind him, especially when driving at highway speeds.
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Your first & last sentence are at odds with each other.
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If a driver looks ahead & sees an obstacle, in this case a slowed car, then glances in rear &/or side view mirrors to see than the next lane is clear to make a change, why should he then be focusing back at a vehicle that is in a now-different lane behind him to see whether that vehicle is slowing or not. The driver should be focused on cars in front of him potentially swerving into his lane & be prepared to avoid them as opposed to playing superhero to alert the vehicles behind him that traffic in front of them has slowed by “flashing my brakes rapidly when confronted with stopped traffic in front of me”
Unless you live in the town of Monster-Truckville, or drive < 10 mph, most cars don’t have enough ground clearance to make that possible to do while keeping your eyes on the road ahead. So tell me, when you drive, do you sit on your superhero cape or drape it over the back of the seat behind you? :rolleyes: