Dangerous speed limit sign recognition errors - To Me, This Is So Bad!

[Jimrpa]

Maybe fair, but the speed limit sign recognition feature appears to me to be part of the cruise control function - not Blue Cruise. I think the speed limit sign thing works even with Blue Cruise turned off, unless you do as others have done and deactivate that specific feature.

Could be wrong.

The comments about speed sign recognition are valid. I drive on a limited access roadway to work that has electronic speed signs and the BlueCruise system NEVER recognizes “35”. It has no problems with other values on the signs. This is much less of a problem when the speed limit on a limited access highway is changing from 45 to 35 or 35 to 55. I can figure that out myself and take appropriate action (after all, I’m driving, not BlueCruise).

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[Nemy]

Do you do cruise control normally on this road? I can't think of a 35mph road I would use cruise control on, let alone blue cruise. I would also think that blue cruise would freak out over the driveways and line breaks.

 

[redMachE22]

Would the OP consider changing the title of this thread to "Dangerous speed limit sign recognition errors"?

The way its written currently is pretty click bait-y.

Sure, I will change the title as suggested. I am very much don't like about your suggestion of bait click.

 

[redMachE22]

Do you do cruise control normally on this road? I can't think of a 35mph road I would use cruise control on, let alone blue cruise. I would also think that blue cruise would freak out over the driveways and line breaks.

I think I may have misspoke. My wife was not using BlueCruise. She is using the regular cruise control. There is no point of using BlueCruise locally now that I think about it.

 

[mateo]

I wouldn't use cruise control at 35 mph even on a "dumb" car.

That said, this is scary stupid behavior on the car's part. In no way should a car automatically adjust its speed 50 mph because it saw a sign. If a human saw a sign that said 85 mph in a residential area, it would be ignored.

This isn't "artificial intelligence" -- this is just plain criminally lazy implementation. At minimum, things that should be considered as other inputs:

* What's the delta between current speed and recognized speed?
* Are other cars going 85 mph?
* How many lanes / what's the terrain look like?
* What does the GPS mapping information think?

If software cannot be rolled out safely and responsibly then it ought not be even possible to enable. A good measuring stick is "If this feature is enabled will it result in fewer fatalities and accidents?" I understand that unfortunate accidents may occur with driver-assist functionality, but ultimately if it's safer than human drivers it is worth having.

 

[A-A-Ron]

Yep, I disabled mine as well, but for the reverse reason.

Gotta hate doing 35 in an 85 zone?

 

[Blue highway]

just a techie nit pick thing to consider...

Did the car "see" an 85MPH sign in a residential area? I seriously doubt it.

More likely what did happen was that the GPS thought it was on a nearby interstate where the speed zone is 85MPH... There are lots of threads relating to the GPS indicating the wrong location.

The "so what" is that if the GPS location is showing wrong, you really don't want to use "speed sign recognition" in cruise control.

On a related note... My neighbors put up official looking 15MPH speed signs in our neighborhood. my car has never responded to these. But, via GPS the car knows the speed limit is 25MPH as soon as you turn off the main road... with no speed sign in sight. It rolls past the 15MPH signs with no reaction.

 

[redMachE22]

just a techie nit pick thing to consider...

Did the car "see" an 85MPH sign in a residential area? I seriously doubt it.

More likely what did happen was that the GPS thought it was on a nearby interstate where the speed zone is 85MPH... There are lots of threads relating to the GPS indicating the wrong location.

The "so what" is that if the GPS location is showing wrong, you really don't want to use "speed sign recognition" in cruise control.

On a related note... My neighbors put up official looking 15MPH speed signs in our neighborhood. my car has never responded to these. But, via GPS the car knows the speed limit is 25MPH as soon as you turn off the main road... with no speed sign in sight. It rolls past the 15MPH signs with no reaction.

It could be, however, in this area, the max speed is 65. So, if you are right, it must be a very bad GPS miss fire.

 

[RobbertPatrison]

just a techie nit pick thing to consider...

Did the car "see" an 85MPH sign in a residential area? I seriously doubt it.

More likely what did happen was that the GPS thought it was on a nearby interstate where the speed zone is 85MPH... There are lots of threads relating to the GPS indicating the wrong location.

The "so what" is that if the GPS location is showing wrong, you really don't want to use "speed sign recognition" in cruise control.

The jump to 85mph happened to me on a local road. The nearest highway was miles away. In California, there are no highways with 85mph limits, so I doubt that a faulty GPS location is the root cause. It can simply be a bug in the database. Or a programming bug.

The MME's speed limit is determined by a map database and GPS. This is overridden in case the camera detects another sign. I blocked the camera as an experiment, and it still set mostly the correct speed limit.

 

[Blue highway]

The jump to 85mph happened to me on a local road. The nearest highway was miles away. In California, there are no highways with 85mph limits, so I doubt that a faulty GPS location is the root cause. It can simply be a bug in the database. Or a programming bug.

The MME's speed limit is determined by a map database and GPS. This is overridden in case the camera detects another sign. I blocked the camera as an experiment, and it still set mostly the correct speed limit.

I don't think the camera detects anything... I've never seen any evidence that it does. The GPS based location works even when there is no sign to be seen. your experiment seems to bear that out.

If it is a database problem, this is 100% repeatable. just drive to the same location where it happened and look at the speed the car thinks is the speed limit (it shows on the instrument panel) it it's 85, then sure database issue. If it is the right local speed, then it's not a database issue.

 

[2ndPony]

What I hate worse is the car making up it's own speed limits. There are several repeatable areas on the secondary roads around my house that all have a 45 mph speed limit. Using cruise control and the car recognizing the 45 mph limit it will jump to a 55 mph setting. Two locations where this occurs there are no speed limit signs nearby. The other one is just past a 45 mph sign which is mostly obscured by vegatation. That one is the first one that I noticed doing this. The speed limit before and after is 45 so there should be no change but it resets to 55. I guess this one could be related to the obscured sign but it is well past where it would normally change after passing a sign unless the change is delayed by it being confused. Very exciting when for no reason it floors it trying to get that extra 10 mph. Anyone else seeing this behavior?

 

[mkhuffman]

I wouldn't use cruise control at 35 mph even on a "dumb" car.

I use it around town all the time. On a 35 mph road, I set my cruise to 42 (or something like that) and my car keeps pace with the car in front of me. It is awesome. And if that car decides to go faster, I don't inadvertently follow him into a speed trap.

Why wouldn't you use it like that? It works great for me. And with the MME, I can easily go way, way over the speed limit without even noticing. Hence, cruise control.

 

[Blue highway]

What I hate worse is the car making up it's own speed limits. There are several repeatable areas on the secondary roads around my house that all have a 45 mph speed limit. Using cruise control and the car recognizing the 45 mph limit it will jump to a 55 mph setting. Two locations where this occurs there are no speed limit signs nearby. The other one is just past a 45 mph sign which is mostly obscured by vegatation. That one is the first one that I noticed doing this. The speed limit before and after is 45 so there should be no change but it resets to 55. I guess this one could be related to the obscured sign but it is well past where it would normally change after passing a sign unless the change is delayed by it being confused. Very exciting when for no reason it floors it trying to get that extra 10 mph. Anyone else seeing this behavior?

more likely related to the city changing the speed signs from 55 to 45 at some point and not updating the records anywhere. The database in the nav will see that stretch of road still mapped to 55.

Try this... drive that stretch of road and look at the speed in apple maps or google maps... if it shows 55, (remember those apps deal 100% with the GPS location to know the speed limit) then the city or county changed the speed without doing the paperwork.

 

[dtbaker61]

depending on your car to read signs, instead of you, is dangerous to start with..... who would be liable for instance if somebody got out some black electrician's tape and changed a sign to read 25 to 85 ?!

 

[ChuckA]

For me, the sign speed recognition doesn’t see yellow signs.

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