"imagine if you could see real-time traffic updates from friends and fellow travelers ahead of you, calling out “fender bender...totally stuck in left lane!”"

"imagine if you could see real-time traffic updates from friends and fellow travelers ahead of you, calling out “fender bender...totally stuck in left lane!”" Yandex Maps do that, like, forever by letting users to mark accidents, road works and other events on the road as they drive - for fellow drivers to see. Works pretty fine and sometimes even a bit socially.