Has Tesla added the Blind Spot Alert in the mirror or are you talking about the abstract video that pops up in the down and to the right screen? The graphic doesn't work either as they are in your blind spot by the time it sees them. There is collision alert where when you actually start to steer into an occupied lane but no alert.
There is no rear cross traffic alert. Tesla is blind in the back.
If you want both, I added them via a
Rydeen Systems setup by
Mobile West.
Lane keep alert (not Lane Keeping of AutoSteer, basic drifting over the line alert. Works 50% at best. When I first got the car I reported the problem to Tesla. Mobil Tech came out and we drove down Marine Drive to test and it would not alert or tug wheel. Hmm....tech calls Fremont as we drive. Fremont says it is geo fenced for some roads which made no sense but there we were merrily crossing over center line or curb line. Overall, sometimes it works, sometimes it doesn't. Appears issue is related to Full Self Driving software.
The Teslas been a reliable car, 100k, and just the regular mechanical issues they cover (front suspenion replaced, leaking trunk harness, seat wiring harness) but the flaws on ADAS are bad and documented.