5 ms·

> Summary is that "people riding bikes" (PRB) is a much denser image set than "people in cars" (PIC) and "people walking or jogging" (PWJ), and the PRB objects

by saulrh 10y ago

> Summary is that "people riding bikes" (PRB) is a much denser image set than "people in cars" (PIC) and "people walking or jogging" (PWJ), and the PRB objects have a much higher dynamic angular vector capability (they can change direction extremely quickly) combined with a wider dynamic velocity vector to PWJ they strain the ability of the predictive filters to reliably asses the collision threat. As a result you need either faster/better hardware or better algorithms to deal with that particular group. Nice analysis of why bicycles are so dangerous even now - computational issues like these are just as much an issue for brains as for computers. Not surprising that, in many cities in the US, biking is insane. Nearly everybody I know that bikes to work has a close call or two in their history.

deleted 10y ago
[deleted]
stouset 10y ago
> Nearly everybody I know that bikes to work has a close call or two in their history. Nearly everybody you know has had a close call or two with driving, I'm sure. And not just an "almost a minor fender-bender where everyone would have been okay" close call either. Cars are one of the leading causes of death for people of all ages. I've had close calls with cars as a pedestrian, as a cyclist, as a motorcyclist, and as an occupant in cars. I've been hit by a car while on a bicycle. Cars as an entire category are dangerous, as are the humans who operate them.
- eridius 10y ago
  The difference is a "close call" on a bike has a far higher chance of being lethal than a "close call" in a car.
  - stouset 10y ago
    Not if you're the unfortunate pedestrian or cyclist who finds themselves on the wrong side of the "accident with a car" equation.
- dvtv75 10y ago
  It's rather funny that the cyclist who rides downhill at 40mph outside my home every day classifies cars as the hazard and not himself, since he must ride on the road and not the footpath. He's no different to the guy who was riding at a similar speed on the footpath outside of my work. Apparently that was OK, you see, because if he was on the road he would have been riding the wrong way on a one way street and there was no way he was going to ride around the block to get on the southbound road. He nearly hit me every day after work for a month, because he was cutting blind corners at speed. What about the two who were occupying a whole traffic lane, weaving back and forward to stop cars overtaking, while riding at under 15mph in a 40mph area? They'd start screaming like lunatics at anybody who legally overtook them - the cops wanted a word with them, but they disappeared when they saw me on my phone. Five or six times a day, cyclists run a red light at a busy intersection in town. I see many near-accidents in my fleeting times in that intersection, all of which are caused by the cyclists - and I'm not counting the number of times they've nearly hit pedestrians crossing with the red light. I've seen one car run a red light, three years ago, since I started crossing there in 2012. Years ago, I was overtaken by a cyclist and his three children, just as I had begun my turn. I nearly ran over the father, and they took their sweet time to move through the intersection a car coming the other way (who legally had the right-of-way) had to stop and wait for them. I could have got out of my car and walked, and I would have got to the other side before they did. They bumbled along as if they'd done nothing wrong. It's not uncommon for cyclists enter intersections on foot, and so legally become pedestrians for the duration of the crossing, and then jump on their bikes and dodge through traffic while hurling obscenities at vehicles who have right-of-way because they didn't enter as pedestrians. The law here doesn't change your status because it's convenient for you. Back in 2013, one of my ex-workmates told me quite a tale, about the time she pulled up at a set of lights. When she moved off she signaled to change lanes and only noticed by chance that there was a cyclist holding onto her car to get a free ride. He couldn't have seen her signal, the indicator was near his foot, and if she had turned he would have toppled in high speed traffic, perhaps ending up under her wheels. Back in the early 1990s, a friend of mine was pulling out of his garage and was hit by a cyclist at some speed - the cyclist threatened to call the police, but stopped short he would have been charged, not my friend. Don't lump it all on drivers, cyclists are dangerous, too.
  - 10y ago

by saulrh 10y ago

deleted 10y ago

[deleted]

stouset 10y ago

> Nearly everybody I know that bikes to work has a close call or two in their history. Nearly everybody you know has had a close call or two with driving, I'm sure. And not just an "almost a minor fender-bender where everyone would have been okay" close call either. Cars are one of the leading causes of death for people of all ages. I've had close calls with cars as a pedestrian, as a cyclist, as a motorcyclist, and as an occupant in cars. I've been hit by a car while on a bicycle. Cars as an entire category are dangerous, as are the humans who operate them.

eridius 10y ago
The difference is a "close call" on a bike has a far higher chance of being lethal than a "close call" in a car.
- stouset 10y ago
  Not if you're the unfortunate pedestrian or cyclist who finds themselves on the wrong side of the "accident with a car" equation.
dvtv75 10y ago
It's rather funny that the cyclist who rides downhill at 40mph outside my home every day classifies cars as the hazard and not himself, since he must ride on the road and not the footpath. He's no different to the guy who was riding at a similar speed on the footpath outside of my work. Apparently that was OK, you see, because if he was on the road he would have been riding the wrong way on a one way street and there was no way he was going to ride around the block to get on the southbound road. He nearly hit me every day after work for a month, because he was cutting blind corners at speed. What about the two who were occupying a whole traffic lane, weaving back and forward to stop cars overtaking, while riding at under 15mph in a 40mph area? They'd start screaming like lunatics at anybody who legally overtook them - the cops wanted a word with them, but they disappeared when they saw me on my phone. Five or six times a day, cyclists run a red light at a busy intersection in town. I see many near-accidents in my fleeting times in that intersection, all of which are caused by the cyclists - and I'm not counting the number of times they've nearly hit pedestrians crossing with the red light. I've seen one car run a red light, three years ago, since I started crossing there in 2012. Years ago, I was overtaken by a cyclist and his three children, just as I had begun my turn. I nearly ran over the father, and they took their sweet time to move through the intersection a car coming the other way (who legally had the right-of-way) had to stop and wait for them. I could have got out of my car and walked, and I would have got to the other side before they did. They bumbled along as if they'd done nothing wrong. It's not uncommon for cyclists enter intersections on foot, and so legally become pedestrians for the duration of the crossing, and then jump on their bikes and dodge through traffic while hurling obscenities at vehicles who have right-of-way because they didn't enter as pedestrians. The law here doesn't change your status because it's convenient for you. Back in 2013, one of my ex-workmates told me quite a tale, about the time she pulled up at a set of lights. When she moved off she signaled to change lanes and only noticed by chance that there was a cyclist holding onto her car to get a free ride. He couldn't have seen her signal, the indicator was near his foot, and if she had turned he would have toppled in high speed traffic, perhaps ending up under her wheels. Back in the early 1990s, a friend of mine was pulling out of his garage and was hit by a cyclist at some speed - the cyclist threatened to call the police, but stopped short he would have been charged, not my friend. Don't lump it all on drivers, cyclists are dangerous, too.
- 10y ago