4 ms·

Normal collision detection systems don’t try to use cameras. Radar will have no issues in an instance like this if the detection zone is vertical enough

vsskanth 3y ago
This particular Tesla was pre 2021 so it should have both radar and cameras.
- deleted 3y ago
  [deleted]
- daveguy 3y ago
  So after 2021 Tesla got even more irresponsible?
ricardobeat 3y ago
The detection zone is not vertical enough. Radar is tuned to mostly ignore overhead objects otherwise you’d have phantom emergency braking whenever entering a tunnel, parking garage or going through a pedestrian crossing. It wouldn’t normally have enough accuracy to distinguish between that, and the 1.5m high side of a semi truck. Modern tech is changing that, but most collision prevention systems of today will not prevent this type of accident. Yet another reason to make guards mandatory. There are thousands of underride crashes and hundreds of deaths yearly, you only hear about the “automated driving” ones because it brings more clicks.
- katbyte 3y ago
  I tried but found nothing to verify your claim most collision avoidance systems do not sense veritable enough, nor anything discussing them plus truck guards outside Tesla failing. Can you please provide some sources for your claims?
  - ricardobeat 3y ago
    That was just off the top of my head, but here are some links I found: https://www.ti.com/lit/wp/spry312/spry312.pdf https://www.ti.com/lit/wp/spry312/spry312.pdf shows how 24ghz radar, the most common until recently, has resolution measured in half-meter increments https://www.kiforte.com/fca_radar-656.html https://www.kiforte.com/fca_radar-656.html Kia manual showing how the radar cone only covers a height of 1.2 meters in front of the car These radar sensors project a very wide beam, they can't see much right in front of the car. For example, there was a car reviewer on YouTube that recently put ultrasonic parking sensors against a camera-based Tesla, and they perform about the same, with the camera slightly better in some situations because it's looking from above - the bumper-mounted radar cannot see objects in the ground right beneath it. Honda also just added a camera in their latest generation collision avoidance system, to cover a wider range of situations.
    - katbyte 3y ago
      A half meter is fine, more then enough to look for 2-3m of “thing” Infront of the car And that is not specifying the cone/detection range of the radar? It is just the work area to keep clear while performing an alignment - otherwise the horizontal range of the sensor would be near useless Ultra sonic is not radar, and using radar cars regularly will follow things 10s of meters away. Seeing a semi with them is not a problem. Parking is not collision avoidance- and using cameras for it is dumb. They don’t work in fog snow or adverse conditions that radar will
      - ricardobeat 3y ago
        None of what you’re saying contradicts my earlier points. How can radar tell the difference between a 1.5m high truck undercarriage, and a 2.1m high passage if resolution is .5m? If they could detect the truck, why aren’t cars constantly triggering emergency brakes when near an underpass? Why are 10000+ collisions and 100+ deaths like this happening every year when a majority of cars have these systems installed? Why did Honda add cameras if radar is good enough? The answers seems obvious, but you can do your own research.

vsskanth 3y ago

This particular Tesla was pre 2021 so it should have both radar and cameras.

deleted 3y ago
[deleted]
daveguy 3y ago
So after 2021 Tesla got even more irresponsible?

ricardobeat 3y ago

The detection zone is not vertical enough. Radar is tuned to mostly ignore overhead objects otherwise you’d have phantom emergency braking whenever entering a tunnel, parking garage or going through a pedestrian crossing. It wouldn’t normally have enough accuracy to distinguish between that, and the 1.5m high side of a semi truck. Modern tech is changing that, but most collision prevention systems of today will not prevent this type of accident. Yet another reason to make guards mandatory. There are thousands of underride crashes and hundreds of deaths yearly, you only hear about the “automated driving” ones because it brings more clicks.

katbyte 3y ago
I tried but found nothing to verify your claim most collision avoidance systems do not sense veritable enough, nor anything discussing them plus truck guards outside Tesla failing. Can you please provide some sources for your claims?
- ricardobeat 3y ago
  That was just off the top of my head, but here are some links I found: https://www.ti.com/lit/wp/spry312/spry312.pdf https://www.ti.com/lit/wp/spry312/spry312.pdf shows how 24ghz radar, the most common until recently, has resolution measured in half-meter increments https://www.kiforte.com/fca_radar-656.html https://www.kiforte.com/fca_radar-656.html Kia manual showing how the radar cone only covers a height of 1.2 meters in front of the car These radar sensors project a very wide beam, they can't see much right in front of the car. For example, there was a car reviewer on YouTube that recently put ultrasonic parking sensors against a camera-based Tesla, and they perform about the same, with the camera slightly better in some situations because it's looking from above - the bumper-mounted radar cannot see objects in the ground right beneath it. Honda also just added a camera in their latest generation collision avoidance system, to cover a wider range of situations.
  - katbyte 3y ago
    A half meter is fine, more then enough to look for 2-3m of “thing” Infront of the car And that is not specifying the cone/detection range of the radar? It is just the work area to keep clear while performing an alignment - otherwise the horizontal range of the sensor would be near useless Ultra sonic is not radar, and using radar cars regularly will follow things 10s of meters away. Seeing a semi with them is not a problem. Parking is not collision avoidance- and using cameras for it is dumb. They don’t work in fog snow or adverse conditions that radar will
    - ricardobeat 3y ago
      None of what you’re saying contradicts my earlier points. How can radar tell the difference between a 1.5m high truck undercarriage, and a 2.1m high passage if resolution is .5m? If they could detect the truck, why aren’t cars constantly triggering emergency brakes when near an underpass? Why are 10000+ collisions and 100+ deaths like this happening every year when a majority of cars have these systems installed? Why did Honda add cameras if radar is good enough? The answers seems obvious, but you can do your own research.