6 ms·

It needs to be going under 40mph and on a highway, which sounds like this only works in stop and got traffic on the freeway. Pretty cool.

by blhack 4y ago

jeffbee 4y ago
I wonder why that speed limit would exist. Sensor range? Computational power? It seems like the difference between being able to self-drive at 40 and at 65 on the same road would not be all that significant.
- zip1234 4y ago
  Perhaps because 65 has exponentially more energy in collisions and more likely to cause death? If it is limited to 40, death is less likely and therefore chance of negative news. So I would venture just a risk calculation for initial release.
  - sib 4y ago
    Literally 164% more energy - not exponentially.
    - zip1234 4y ago
      You used 1/2mv^2? It is 2.64 times the energy. Squared means it is increasing exponentially
      - jeffbee 4y ago
        No, quadratically. Exponentially would be if it was some term raised to the exponent of the velocity.
        zip1234 4y ago
        Ok, fair enough—-looks like I cannot update the original post anymore though
- FinnKuhn 4y ago
  I first thought it might have something to do with the range of LIDAR sensors and breaking distance, but that doesn't seem to be the case as LIDAR sensors can detect objects at around 200m away and a car at 60kmh needs only around 50m to break comfortably. While I don't know if this is the reason 60kmh is the limit for this system to be allowed to drive on German highways a vehicle needs to be able to drive 60kmh, so this might be the reason, but I am not an expert so who knows.
  - upbeat_general 4y ago
    It's important to distinguish the sensor range vs. the range at which your model can accurately perform detection. There's time involved in solidifying the prediction, performing computations, and you also want a safety margin for a backup system to intervene, etc. Lower speeds means you have more timing tolerance for all your systems.

It needs to be going under 40mph and on a highway, which sounds like this only works in stop and got traffic on the freeway. Pretty cool.

by blhack 4y ago

It needs to be going under 40mph and on a highway, which sounds like this only works in stop and got traffic on the freeway. Pretty cool.

jeffbee 4y ago

I wonder why that speed limit would exist. Sensor range? Computational power? It seems like the difference between being able to self-drive at 40 and at 65 on the same road would not be all that significant.

zip1234 4y ago
Perhaps because 65 has exponentially more energy in collisions and more likely to cause death? If it is limited to 40, death is less likely and therefore chance of negative news. So I would venture just a risk calculation for initial release.
- sib 4y ago
  Literally 164% more energy - not exponentially.
  - zip1234 4y ago
    You used 1/2mv^2? It is 2.64 times the energy. Squared means it is increasing exponentially
    - jeffbee 4y ago
      No, quadratically. Exponentially would be if it was some term raised to the exponent of the velocity.
      - zip1234 4y ago
        Ok, fair enough—-looks like I cannot update the original post anymore though
FinnKuhn 4y ago
I first thought it might have something to do with the range of LIDAR sensors and breaking distance, but that doesn't seem to be the case as LIDAR sensors can detect objects at around 200m away and a car at 60kmh needs only around 50m to break comfortably. While I don't know if this is the reason 60kmh is the limit for this system to be allowed to drive on German highways a vehicle needs to be able to drive 60kmh, so this might be the reason, but I am not an expert so who knows.
- upbeat_general 4y ago
  It's important to distinguish the sensor range vs. the range at which your model can accurately perform detection. There's time involved in solidifying the prediction, performing computations, and you also want a safety margin for a backup system to intervene, etc. Lower speeds means you have more timing tolerance for all your systems.