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#water#road#recall#waymo#car#drive#driving#update#don#cars

Discussion (82 Comments)Read Original on HackerNews

Animatsabout 3 hours ago
That's a tough problem - distinguishing wet pavement from deep water. Humans make that mistake frequently. Autonomous vehicles should probably be equipped with a water sensor. (We did that in our DARPA Grand Challenge vehicle back in 2005). Then they can enter water very cautiously and see if it's too deep. This may make them too cautious about shallow puddles on roads, though.
drob518about 2 hours ago
It’s a particularly hard problem in Texas. We get torrential rains and the landscape is relatively flat. Couple that with shallow soil over lots of limestone and it means flooding is really common. We also have roads that have a “low water crossing,” where a road crosses a creekbed that is normally dry but which will flood. There are often water depth signs there (basically a vertical ruler with feet marks so you can see where the water is up to). We lose people to this scenario (driving into flood waters) every year. It’s particularly problematic when it’s dark and you miss a warning sign. Before you know it, you’re in deep water and the flow can sweep the whole car downstream until it gets pinned against a tree, possibly with water forcing its way into the car.
reaperducer6 minutes ago
Texas has it easy.

I've seen several places in England (and at least one in the western United States) where they have fords.

For those not familiar, water runs over the road full-time, and people are expected to just drive through it like it's no big deal. Except for right after a storm, when it is a big deal. It's essentially the intersection of a road and a stream where a bridge should be, but nobody ever built one.

wombat-manabout 2 hours ago
If they have a laser measurement of the road from before, couldn't they see that the level of water vs the expected road surface?
jandrewrogers14 minutes ago
You underestimate how frequently details like this change in the real world and how difficult it is to reliably integrate them into the mapping models with very low error rates.

Aggregating this data in something close to real-time, verifying and corroborating that the change to the road model is real and correct, and then pushing those model updates to every vehicle that may need it almost immediately is not really a solved problem.

tintorabout 2 hours ago
Such detailed database of fine grained road geometry gets stale very quickly, due to road maintenance and road construction. In US highway lanes are shifted sideways frequently.
Ajedi3217 minutes ago
Pretty sure they already rely on such a database for positioning, so they already have that problem.

But yes, this wouldn't work for other self-driving systems that don't rely on HD maps.

jjmarr27 minutes ago
I traveled to Austin 3 weeks ago and there were entire highways not on Google Maps.

Apparently they were built in just a few months.

dietr1chabout 2 hours ago
But are they not continuously updating the road database with their fleet?
kpw94about 2 hours ago
That seems a very risky assumption for any car (self driving or human driver) during flash floods. "Turn around don't drown":

You think you know how deep it is under because you've taken that road many times before (or in your case you have historical laser measurement)

But you don't know:

- Maybe the road under fully collapsed

- Maybe the flow of water is extremely strong, so you need to accurately estimate that too.

ex-aws-dude28 minutes ago
That's so much extra complexity
AnimalMuppetabout 2 hours ago
If they have a pre-existing database of every road, sure. And if it's kept up-to-date at all times in all vehicles.
spankaleeabout 1 hour ago
Waymo does have a database of every today they drive, but for this they don't need one.

If the car comes to a road covered with water, and that road is in the database, and the water level appears low compared to the historical level of the road in the DB, then the car could cross. if the road is not in the DB, then a different decision might be made.

This is similar to humans: you might make different decisions depending on whether you know the road well or not.

mortenjorckabout 2 hours ago
Isn’t that the Waymo data model, though? They extensively pre-drive every new market, building dense volumetric maps of the entire service area before they begin service, so they essentially do have that database of every road (that they drive on).
ajkjkabout 1 hour ago
Pretty sure the right answer mainly involves the car knowing about the weather and other emergency events.
asdffabout 1 hour ago
It doesn't take much of a rainstorm to see localized flooding. Some debris over the storm drain is enough to flood a street. Hard to anticipate that happening.
nradov7 minutes ago
Dangerous localized flooding has also occurred for other reasons unrelated to weather, like broken dams or embankments.
amlutoabout 2 hours ago
By a water sensor do you mean a sensor to detect the water level relative to the chassis? It seems like a very inexpensive downward-facing ultrasound sensor could work.
tempaccount5050about 1 hour ago
When you're going 35 mph and suddenly hit a 2 ft deep puddle (I've done this), that sensor isn't going to help at all.
computomaticabout 2 hours ago
Is ultrasound less expensive than a moisture sensor?

The problem with both is they effectively require the vehicle to be in the water already. They need something that can tell depth before the vehicle has to slow down.

OptionOfTabout 2 hours ago
Doesn't Land Rover historically have like a wading sensor?
mmoossabout 2 hours ago
> frequently

I've never made that mistake; I'm not aware of anyone I know doing it. I very rarely see it myself, except on news footage. Of course it happens some time somewhere but that says nothing about frequency.

> That's a tough problem

Not really. Don't drive where you don't know it's safe. Definitely don't drive into moving water - puddles only, and only if not too deep: I can usually figure it out based on the rest of the road - unless it's a sinkhole, the geometry is somewhat consistent - and especially by looking at objects in the water such as other cars driving through it. Sorry your friend isn't competent to figure it out.

People here are always quick to defend the autonomous cars, like a close friend. How often will we fall in love with a technology or company? It always distorts the truth.

hawaiianbrahabout 1 hour ago
It’s definitely a thing humans do a lot in certain places. Perhaps where you live, it isn’t as much of an issue, so naturally you and nobody you know has encountered it.
robrainabout 2 hours ago
Article's current (possibly original), less ambiguous title: "Waymo recalls 3,800 robotaxis after glitch allowed some vehicles to ‘drive into standing water’"

IOW 3,800 Waymo vehicles aren't currently sat spinning their wheels in water.

Zigurdabout 2 hours ago
It's an interesting case of whether it's possible to infer the condition of wading and avoid having to install a sensor specific to a one in a million trips circumstance.

The inference would come from standing water slowing down the vehicle and likely require steering correction, in combination with some machine vision for identifying standing water.

Then there's the advantage of being Google and having hundreds of thousands of people in the same area using Google maps and navigation. Accelerometers in phones can detect crashes pretty reliably. There's a good chance they can reliably detect deceleration from standing water and report the location of the hazard.

chaidhat26 minutes ago
Maybe they're secretly developing Waymo submarines..
moribvndvsabout 2 hours ago
Waymo: *locks doors, chorus to Floods by Pantera starts playing, guns it into the water*

“Wash away maaaaan, take him with the floooood”

sunrunnerabout 2 hours ago
How about a Mastodon, Lamb of God take with Floods of Triton:

  Heap data upon this modern age
  All human drivers now phased away
  A lidar's glow, the soft wheel's echo
  Autonomous force of code remains
  
  We are last of the before rides
  Now hear the robot cars rise
  Hum into eternity
  Remember this, all roadways lead to the fleet
srameshcabout 2 hours ago
Does anyone with a better understanding about LIDAR vs camera approach to autonomous drivng explain how would Tesla handle such situation ?
xnxabout 2 hours ago
Waymo has LIDAR and cameras, so it is better equipped for every situation.
lizardkingabout 2 hours ago
whimsicalism4 minutes ago
part of the problem is that SFs traffic lights just turn off in a power outage, rather than flashing red battery power as I have seen in many other jurisdictions
xnxabout 2 hours ago
Kind of unrelated. That issue was due to a misguided effort to be cautious by having vehicles requesting human-review when they didn't really need it. Waymo fixed the issue by allowing the vehicles to operate in their normal, independent, mode.
tintorabout 2 hours ago
LIDAR isn't helpful for water. Standing water behaves like a mirror on LIDAR.
stevekempabout 1 hour ago
This is one of the reasons why I'm suspicious of camera-only systems, here in Finland. Half the year there's a lot of snow and ice around. Which I imagine means most of the view is "white" and "shiny". Coupled with the dark winters it's gotta be a nightmare to deal with.
whimsicalism3 minutes ago
do humans drive in it?
throwway120385about 2 hours ago
Could you use a different spectrum of EM radiation to detect water? There are parts of the microwave band that attenuate the signal by absorption and I wonder if you could use that. The only clue a human driver has in that situation is in the visible spectrum. The lines of the road disappear from view, which can be challenging to see at night.
amlutoabout 2 hours ago
If the LIDAR can sense the road close enough to the front of the car, then it could estimate how far underwater the car is.
blueskies1029about 2 hours ago
They are rolling these out in New Orleans soon. Standing water is everywhere, and sometimes you have big hidden potholes. You just need to know the roads. Should be fun.
bethekidyouwantabout 2 hours ago
What is a recall in this case? Is them getting a software update a recall now?
Veserv8 minutes ago
"Recall" is a technical term meaning: "public dangerous defect notice".

A "recall" is stating that the defective version of the product in the field must be "removed/recalled" and replaced/updated with a non-defective version at the manufacturer's expense. It just so happens that the removal and replacement of defective software from the field can occur remotely.

The important part is that the manufacturer delivered a defective product that risks your safety, that fixing that safety defect is the responsibility of the manufacturer, and the system is unsafe until that occurs.

superfrankabout 2 hours ago
They suspended service areas they deem high risk until the software update can be applied. So while, yes, it's just a software update, it's a recall in the sense that they've temporarily pulled all the cars off the road in certain areas
svachalekabout 2 hours ago
I think so. For some kind of legalese reasons that's generally what a Tesla "recall" amounts to these days.
SpicyLemonZestabout 2 hours ago
Yes, this is a common terminology issue. "Recall" is legally defined in terms of the kind of problems that require one, not the solution to those problems, because the relevant regulations were written when there was no way to fix consumer products other than physically delivering them to the manufacturer or an authorized repair person.
gib444about 2 hours ago
This is ok though because humans drive into flood waters too.

Look, you can't make progress without getting your feet wet and then diving straight into the deep end.

foobazgtabout 2 hours ago
Maybe you drive into flood waters, but I don't. That's not a difficult skill to pull off.

We're still in the early days of self driving cars, and as much simulation and miles as they have, they're still constantly getting exposed to real world conditions that are new to them. The world is dynamic, so this will always remain true.

It remains to be seen where we'll converge on capability, incident rate, and acceptance.

hawaiianbrahabout 1 hour ago
The world is dynamic, so sure, it will always be true in some technical sense. But I am confident that eventually we’ll have trained them on enough scenarios that novelty will have a smaller and smaller effect on their ability to safely navigate through the world.
yieldcrvabout 1 hour ago
Since recall on cars no longer means doing anything to the car's physical location I think the regulator NHSTA should update this term

It just creates alarmist headlines for what's really an over the air update, although "recall" is still currently a regulatory accurate term in the vehicle space

Cars, especially EVs, have many similarities to being phones. Imagine if a routine software update from Apple was called a "recall", that functionally describes what's happening here

NHTSA should at least distinguish between "omg we have to get these cars off the road and bring them to the shop immediately!" versus "over the air software update"

ElijahLynn17 minutes ago
Exactly what I was thinking, the CNBC article feels very clickbity because they don't say that in the opening lead that it's just a software update. They make it sound like they need to be taken back to some factory somewhere and get their systems updated. Which is not true because they just get a software update.
steeleabout 2 hours ago
Go fish
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xnxabout 2 hours ago
"recall" = applies software update
fudged71about 2 hours ago
Also I think it's wrong to call something a recall if it's not owned by customers. Waymo is a service.
asdffabout 1 hour ago
The difference between that and usual software updates I'm guessing is the cars are pulled from service until the update takes place.
dang36 minutes ago
We've updated the title above. Thanks!
dawnerdabout 2 hours ago
Recall makes for better headlines.
rogerrogerrabout 1 hour ago
I really want car companies to just automate publishing “recalls” for every commit pushed to any car ever. Flood this broken term and force a distinction between “the airbags will literally explode and destroy your face” and “the radio volume is too quiet sometimes”
nickthegreekabout 1 hour ago
A "recall" is a specific regulated action. It is announced as a recall because that is what is legally required according to the NHTSA. There is no wiggle room here.
paconborkabout 2 hours ago
Gah, thanks for this. Thought I was used to that slight-of-hand but this one got me
jagged-chiselabout 2 hours ago
aw, I was having fun imagining 3,800 Johnny cabs just immediately changing route to go to headquarters.
Desafinadoabout 2 hours ago
FFS, can we just go back to talking to each other in person and driving our own vehicles? Where'd the 90s go?
vachinaabout 2 hours ago
If the car drives itself we will have more time to talk to each other in person.
Apocryphon11 minutes ago
Actually, we’ve just returned to 2007.

https://youtu.be/DOW_kPzY_JY

cryo32about 2 hours ago
Or invest in public transport instead
superfrankabout 2 hours ago
> can we just go back to talking to each other in person

He posts on an internet message board

Analemma_about 2 hours ago
Just this morning I was almost killed twice on my bike ride to work by two separate drivers, one of whom looked to be 80 and could barely see over the dashboard, and one who was on their phone. I didn’t even bother trying to remember the plate numbers, knowing that the odds of any kind of consequences are absolute zero. No, we can’t go back to driving our own vehicles. Waymo everywhere and human driving outlawed, ASAP.
qwerpyabout 2 hours ago
Agree. Multiple people I know have bought Teslas because they don’t trust themselves or their spouses to drive safely, and want them to use FSD. There should be incentives to get people onto self driving.
flextherulerabout 2 hours ago
Tesla cars are not capable of driving autonomously according to the company and regulators.
mikem170about 2 hours ago
If self-driving is better, then presumably cheaper insurance costs would be an incentive.
giacomoforteabout 2 hours ago
LeCun is right.
alex1138about 2 hours ago
About what
giacomoforteabout 1 hour ago
That you need world models to sensibly deploy "thinking" machines in the real world. Else they do stupid shit like drive straight into water. You can bruteforce some semblance of thinking by training on literally all knowledge that can be digitized but even that is proving to not be quite enough.
jfyiabout 1 hour ago
Like this?

https://waymo.com/blog/2026/02/the-waymo-world-model-a-new-f...

Or did you mean strictly in operation?