By all accounts, my Tesla S is one of the safest cars on the road ... with one glaring exception - The blindspot monitor. One of the reasons I bought a Tesla was for the safety features, but the blindspot monitors (if you can call them that) are nearly useless since they don't accurately notify the driver of cars approaching from the rear on the right or left until its too late. I've noticed that the "radiating lines" that are displayed on the instrument panel (denoting approaching vehicles) don't appear until an approaching vehicle is at my bumper. Having had blindspot monitors on my last three vehicles (and having depended on them), I assumed that Tesla's ultrasonics would be superior, but thus far they are far inferior to most other vehicle manufacturers. I have read online where this has been noted by Tesla, but nothing official from Tesla. I had even heard that the last HW2 update was supposed to have improved this shortcoming, but, alas, it did not. Is there any hope that the ultrasonic sensors will be improved upon - or that the better software/firmware will be developed?