After almost getting creamed tonight in a lane change (not on autopilot) to the left, I am beginning to get the impression that the blind spot detection system on my 2016 Tesla Model S 90D is not nearly as proactive as the side mirror-based warning systems for other cars. On my previous car, a 2015 Mercedes Benz E400 Coupe, it was almost impossible to miss a car traveling behind you, and even if you ignored the warning light in the side view mirror, the turn signal indicator would have a very loud warning beep enabling you to abort the lane change. With the Tesla, the "cone" that you see on your dashboard indicates vehicles on your side, but they are literally right next to you before the alert. I brought my car back to the Tesla store in Paramus and they tell me that the sensors are not adjustable, and that they "all work like that". Not a good answer. Tesla needs to increase the distance that triggers those warning zones. I am just curious whether anyone else out there has experienced the same limitations with blind spot detection, especially on the driver's side rear sensor.