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Back up collision avoidance / blind spot detection??

Siciliano

Member
Apr 6, 2016
372
287
New York
I've been through all the menus, and can't find anything for backup collision avoidance. I think every car I've owned for the past 15 years has had a warning chime when backing up if there's something in the way... from at least 5ft away. Very often cars come out of nowhere, and this has been a great feature in previous cars.

I tested this a few times today in a few parking lots, and intentionally backed up as cars were passing by behind me, and no warning sound, even when I got pretty close. Do you have to have a near collision??? Horrible.

Also, there *is* an option in the menu for "blind spot" monitoring, but it does nothing. My past few previous cars have had a loud audible warning if the turn signal was on and there was a car in the blind spot, or even a car behind the blind spot... I've also tested this, and intentionally put my turn signal on as cars were about to pass me, and no warning sound whatsoever!

For a car in this price range, and this technologically advanced, one would think these would be completely standard features!

Will there maybe be software updates for these issues??
 

stopcrazypp

Well-Known Member
Dec 8, 2007
10,005
4,923
The feature you are looking for is rear cross traffic alert, which Tesla does not have.

There's another thread that discusses this in detail, and I also explain why the current Teslas don't have it and will not have it even with software updates (doesn't have the radar sensors for it on the rear bumper). The best alternative is checking the rear camera view when backing up (others noted the view is a lot wider than in other cars so it's helpful).
Blind Spot Monitoring

Note for the audible warning, the current system does not warn you unless you were at risk of a collision, meaning just turning on your signal does not trigger a warning. You actually have to start moving into the lane for it to warn you. I mention that in my comment and also reference the manual where it mentions this.

Otherwise the only warning is some lines on the visualization (also mentioned in my comment with references to manual).

The blind spot monitoring however is something Tesla can easily improve in software, they just haven't (not sure where feedback can be given to them for them to do so, maybe someone needs to tweet Elon).
 
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elptxjc

Member
Dec 15, 2019
752
143
El Paso, TX
Proper blind-spot monitoring also requires rear radar, the same used for rear cross-traffic alert. If a car is approaching quickly, the camera is not going to catch it on time to warn you, so you pretty much have to assume you don't have blind-spot monitoring. If you're watching your 6 often, then it might. One thing that would immensely help is that when activating a turn signal, the appropriate blind-spot camera should automatically light up on the left side of the dash, where the car picture is. That should be relatively easy to do with a software update... but somebody has to tell Tesla that :). I test-drove a new 2021 Genesis G80 3.5T Prestige, and it had that feature, with the left side of the digital dash (speedo) with the left turn-signal, and the right (tach) with the right turn-signal. And it also has everything else, including mirror signal, audible alert, and steering correction. The rear cross-traffic alert is very important too, so Tesla needs to add rear radar to their expensive LR cars IMO.
 

Siciliano

Member
Apr 6, 2016
372
287
New York
Thanks guys for the input and info.:)

It's funny how much more tech this car has (by far) than any other car I've ever owned, and I've had some pretty expensive luxury cars...so I should just be happy, but these are pretty important safety features IMO.

Why even have "blind spot monitor" as an option in the menu though if it doesn't work??? I get that there's no radar, but I don't see the need for it...since there are cameras on the sides literally aiming backwards, why can't a software update at least have a warning sound when a car is approaching if my turn signal is on?

The same for backing up - they simply need a software update to teach the rear camera to identify cars and people, right? The forward collision avoidance, for example, works great! This has triggered numerous times flawlessly, and I only have it set to medium. The car ahead (sometimes pretty far ahead) turns red on the display and there's a loud warning chime if it thinks I'm headed for a collision. Why can't this same programming be applied to the rear and side cameras? :confused:
 
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JulienW

Active Member
Jul 7, 2018
2,565
2,791
Atlanta
....The forward collision avoidance, for example, works great! This has triggered numerous times flawlessly, and I only have it set to medium. The car ahead (sometimes pretty far ahead) turns red on the display and there's a loud warning chime if it thinks I'm headed for a collision. Why can't this same programming be applied to the rear and side cameras? :confused:
Forward Collision Avoidance uses radar.

Also set your mirrors correctly to avoid blindspots. I haven't HAD a blind spot in any car in decades.

How to Set Rear‐View Mirrors to Eliminate Blind Spots: 6 Steps
 
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stopcrazypp

Well-Known Member
Dec 8, 2007
10,005
4,923
Proper blind-spot monitoring also requires rear radar, the same used for rear cross-traffic alert. If a car is approaching quickly, the camera is not going to catch it on time to warn you, so you pretty much have to assume you don't have blind-spot monitoring.
A car approaching would be in your mirrors (which you should be checking anyways). Blind spot monitor only monitors if there is a car in your blind spot (usually going roughly the same speed as you car). Having the rear radars won't change that. If you look at the diagrams linked, the rear radars are on the left and right and are at roughly 45 degree angles. A fast approaching car from far away will not be caught by those sensors either.
 

stopcrazypp

Well-Known Member
Dec 8, 2007
10,005
4,923
Why even have "blind spot monitor" as an option in the menu though if it doesn't work???
It does work, just that it warns against collision (you actually have to move your car toward the blind spot for it to warn you). That's why it's called "Blind Spot Collision Warning Chime". Others have tested, and it does work.

I get that there's no radar, but I don't see the need for it...since there are cameras on the sides literally aiming backwards, why can't a software update at least have a warning sound when a car is approaching if my turn signal is on?
They can do that, they just don't for some reason. The car is obviously able to detect things in its blind spot given it shows it in the visualization.

The same for backing up - they simply need a software update to teach the rear camera to identify cars and people, right? The forward collision avoidance, for example, works great! This has triggered numerous times flawlessly, and I only have it set to medium. The car ahead (sometimes pretty far ahead) turns red on the display and there's a loud warning chime if it thinks I'm headed for a collision. Why can't this same programming be applied to the rear and side cameras? :confused:
The rear facing side cameras would be blocked in parking, so can't do the same thing as rear cross traffic alert in cars with radar sensors. At most they can do a rear collision warning. They probably don't have as much development resources focused on the rear view as that is less important than the front views.
 

SVMike

Member
Aug 1, 2018
266
331
Silicon Valley
A car approaching would be in your mirrors (which you should be checking anyways). Blind spot monitor only monitors if there is a car in your blind spot (usually going roughly the same speed as you car). Having the rear radars won't change that. If you look at the diagrams linked, the rear radars are on the left and right and are at roughly 45 degree angles. A fast approaching car from far away will not be caught by those sensors either.

Then how is the hardware and software in these cars going to work as a robotaxi?

Mike
 

stopcrazypp

Well-Known Member
Dec 8, 2007
10,005
4,923
Then how is the hardware and software in these cars going to work as a robotaxi?

Mike
To clarify, in this comment I'm saying rear radars used for blind spot monitoring in other cars aren't designed to detect fast approaching vehicles from the rear, due to their angle, not saying necessarily the Tesla rear facing cameras would not, as the angle they aim is different.
 

Gasaraki

Active Member
Oct 21, 2019
1,514
1,005
Syracuse, NY
I've been through all the menus, and can't find anything for backup collision avoidance. I think every car I've owned for the past 15 years has had a warning chime when backing up if there's something in the way... from at least 5ft away. Very often cars come out of nowhere, and this has been a great feature in previous cars.

I tested this a few times today in a few parking lots, and intentionally backed up as cars were passing by behind me, and no warning sound, even when I got pretty close. Do you have to have a near collision??? Horrible.

Also, there *is* an option in the menu for "blind spot" monitoring, but it does nothing. My past few previous cars have had a loud audible warning if the turn signal was on and there was a car in the blind spot, or even a car behind the blind spot... I've also tested this, and intentionally put my turn signal on as cars were about to pass me, and no warning sound whatsoever!

For a car in this price range, and this technologically advanced, one would think these would be completely standard features!

Will there maybe be software updates for these issues??

I know blind spot monitoring is there because it has worked for me.
 

RidgeRunner

Member
Aug 21, 2020
33
9
houston
Will purchasing a Tesla bring me back to cranking my body and neck around to looking in the back window when backing up? I just like that there is an audible alert when backing out of a busy parking lot that a car or human is approaching. Same is true for blind spot detection.
 
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