Comment on Waymo issued a recall after two robotaxis crashed into the same pickup truck
bstix@feddit.dk 9 months agoIf you’re following a vehicle with proper distance and it slams the brakes you should be able to stop in time as you’ve calculated their trajectory and a safe speed behind.
You dont need to calculate their trajectory. It’s enough to know your own.
If a heavy box falls off a truck and stops dead in front of you, you need to be able to stop. That box has no trajectory, so it’s an error to include other vehicles trajectories in the safe distance calculation.
Traffic can move through an intersection closely by calculating a safe distance, which may be smaller than the legal definition, but still large enough to stop for anything suddenly appearing on the road. The only thing needed is that the distance is calculated based on your own speed and a visually confirmed position of other things. It can absolutely be done regardless of the speed or direction of other vehicles.
Anyway. A backwards facing truck is a weird thing to misinterpret. Trucks sometimes face backwards for whatever reasons.
It would be interesting to know how the self driving car would react to a ghost driver.
NotMyOldRedditName@lemmy.world 9 months ago
This doesn’t make sense. It’s why I was saying the car won’t move at a stop light when it goes green until the car is half way down the street.
If the car is 2.5 seconds ahead of me at 60mph on the highway, it’s only 2.5 seconds ahead of me if the other car is doing 60 mph. If the car is doing 0mph then I’m going to crash into it.
It needs to know how fast and what direction the obstacle is going.
bstix@feddit.dk 9 months ago
2.5 seconds at 60 mph is more than enough to come to a full stop. If the car in front of you dropped an anvil (traveling at 0 mph) on the road, you could stop before crashing into the anvil. You do not need to drive into the other cars trajectory path.
NotMyOldRedditName@lemmy.world 9 months ago
You can’t be driving behind that vehicles at 60mph with 2.5s WITHOUT knowing it’s trajectory.
You keep trying to saying it doesn’t need to know the trajectory of all objects around it, but that’s not true.
bstix@feddit.dk 9 months ago
Yes you can. It is a stopping distance. 2.5 seconds at 60 mph is 220 feet. A car can brake from 60 to 0 in less than 220 feet. It will take longer than 2.5 seconds to do, but it won’t hit the object which originally was 2.5 seconds ahead.