Traffic sign Recognition

[L0rdMike]

Does this actually use the camera to work as there is a road close to where I live and the car magically reads a 40 sign that doesnt exist. The road was a 40 while bridge repair went on for a year or two but is now NSL.

Are they using map data to get the speed limit to change and does anyone else have the same experience?

 

[webhiker]

To the best of my knowledge it does NOT use maps, but purely camera.
That said, it is very "inventive". When on motorways (130 km/h) it sees an off-ramp it can look "a long way into the country side" and find a 50 km/h sign, which it then nags me with for the next hour, still on the motorway. Eventually it will resign "the bugger does not adhere to my command" and turns off sign recognition for the rest of the drive.
I dread the day when EU will implement mandatory automatic speed limiter! Lots of sudden braking on the motorway

 

[Reckless1957]

Its uses navigation data and camera.

 

[webhiker]

Its uses navigation data and camera.

The manual (for my model and year - MG4 ER) only mentions camera

 

[Reckless1957]

The manual (for my model and year - MG4 ER) only mentions camera

The manual is incorrect in many ways as it covers many variants and countries. Mine works where there are no road signs whatsoever, it cannot do that from the camera alone.

 

[webhiker]

The manual is incorrect in many ways as it covers many variants and countries. Mine works where there are no road signs whatsoever, it cannot do that from the camera alone.

Cool
Just to be clear; You are referring to the speed sign at the drivers console, upper mid section?

 

[siteguru]

@Reckless1957 has an MG3 Hybrid+ Trophy, so that may work entirely different to how an MG4 Trophy/XPower may work.

(Is this thread yet another "victim" of the Similar Threads section at the bottom of every thread? To me that section seems to increase to amount of forum board cross-pollination).

 

[webhiker]

@Reckless1957 has an MG3 Hybrid+ Trophy, so that may work entirely different to how an MG4 Trophy/XPower may work.

(Is this thread yet another "victim" of the Similar Threads section at the bottom of every thread? To me that section seems to increase to amount of forum board cross-pollination).

Thanks for highlighting this.
As noted I was referring to MG4 ER, which is within this forums scope.

 

[gary333]

Mine often doesn't show a speed limit even though the sat nav shows the speed limit so it must depend on version. Mines a 2025 but was really made in Nov 2023.

My car is happy to pickup signs down side streets and display that. It loves to tell me stretches of dual carriageways are 20 or 30 mph zones.

 

[siteguru]

Thanks for highlighting this.
As noted I was referring to MG4 ER, which is within this forums scope.

Indeed ... but they don't have an MG4 so their advice may not be 100% valid for the MG4. That's the point I was making.

 

[Reckless1957]

Indeed ... but they don't have an MG4 so their advice may not be 100% valid for the MG4. That's the point I was making.

I have had both MG4 and MG3 hybrid so have experienced it on both.

 

[siteguru]

Thanks for clarifying ... that's not something we'd know unless we remembered what everyone had owned. (And you just joined the forum a few weeks ago).

 

[Kithmo]

Its uses navigation data and camera.

It only uses navigation if you have the navigation on, if not it just uses the camera.

 

[webhiker]

It only uses navigation if you have the navigation on, if not it just uses the camera.

That would explain a lot, as I never uses the onboard navigation

 

[Reckless1957]

That would explain a lot, as I never uses the onboard navigation

It reads the speed from map data whether nav is one or not.

 

[ReintjeWA]

If the car hasn't seen a speed sign for a while it will show a blank speed sign on the drivers' screen, which leads me to believe it does not use navigational data. If it did, why would it stop advising of the speed limit?

 

[kiwi]

MG4 owner here. It seems totally camera driven. It will react to anything that looks like a speed sign. Including the defunct speed sign on my own 900m long driveway which we have propped up as a joke.

Also we have in NZ lots of speed changes on roads due to a political ideology clash between the left and right. My MG4 follows the changes as soon as the signs are altered.

 

[pjmmk]

Mine is hopeless whatever it's using. I just disable it. The thing shows national limit dual carriageways (70mph) as 60, national limit single carriageways (60mph) as 40. Waze, on the other hand, is correct all the time (so far at least).

 

[gary333]

It reads the speed from map data whether nav is one or not.

Not how my car works. Mine often shows no speed at all, yet the sat nav is happily showing the speed of the road.

 

[Anon70]

A couple of ways to check if the speed recognition is using sat nav POI. Do you get a speed limit displayed before you have passed any sign on a drive, also when you turn onto a road with a different speed limit to the previous road does the speed limit change before you pass a sign. If the answer to the above is yes then the system must be using a database of stored speeds.

BMW used a separate speed limit POI database with their cars, only issue was this was not updated with the map data so became outdated and made the system almost useless in my local area where 60mph zones changed to 40mph then 30mph and then 20mph. Before the new signs got put up the car kept telling me I was in a 60mph zone