Speed readings

[asti1488]

Hi quick question
Driving along a road the speed shows 30 mph on the satnav but speed on dash shows 20 and bonging over speed sound if I go over 20. Why different speeds showing ?

 

[5teep]

That's a wild difference. I expect a car to show 1 or 2 miles faster than it's actually going (to save them being sued by all the speeders) but 10 miles??

 

[asti1488]

Unless the satnav and the road sign recognition are different versions and one needs an upgrade . Car is only a month old

 

[Alb]

Just switch off the speed sign recognition as it's easily misled or simply wrong.

 

[asti1488]

I’ll give that a try , cheers

 

[stevedee]

It seems to me that the satnav uses published data for speed limits (sometimes out of date) while the other speed is calculated from what the camera sees (sometimes wrong when it catches a glimpse of side-road speed signs).

 

[Ian Key]

They've reduced the speed limit from 40 to 30 on a road near me and the sat-nav still thinks it's 40 and with it being in a built up area with lampposts there are no 30 speed limit signs for the car's camera to see.

 

[Lovemyev]

They've reduced the speed limit from 40 to 30 on a road near me and the sat-nav still thinks it's 40 and with it being in a built up area with lampposts there are no 30 speed limit signs for the car's camera to see.

Same here.
One of the 20Mph roads close by, has been reverted to 30 Mph just recently.
It has confused the hell out of the car .
The cars camera will see the sign fine and advise of the 30 Mph but the Sat Nav detection is still convinced its a 20Mph.
Two systems fighting with themselves and not able to apply joined up thinking unfortunately.
There is definitely a “lag” between what is detects by the camera and the Say Nav and the ability to process the information quickly enough.

 

[Fred69]

It seems to use a combination of cameras and the GPS - as mine changed recently to mostly displaying "---" when the limit was 60, but then generally getting the lower speed limits right.

I randomly clicked into the navigation tile (which I don't usually use) and it was asking me to confirm data privacy settings. Once I accepted those, then the speed recognition returned to showing 60 more consistently.

No idea why it uses a combination - most frustrating not to have some kind of override when the cameras pick up a side road at 30 in a 50 zone..

 

[Micropop]

Yesterday I drove through an urban area close to a school. Speed limit is 30kph with speed bumps. Both satnav and sign recognition stated 110kph! . Maybe it had been adding up the last couple of speed signs!

 

[GRM]

On many S5's the camera is set too wide so it picks up the signs on the side streets, so it alerts you, bong. The sat nav speed is more than not the correct one. As stated turn off the sign recognition. Has anyone been able to get MG to adjust the camera without affecting other safety features?

 

[Black estate]

On many S5's the camera is set too wide so it picks up the signs on the side streets, so it alerts you, bong. The sat nav speed is more than not the correct one. As stated turn off the sign recognition. Has anyone been able to get MG to adjust the camera without affecting other safety features?

That's the fault with those systems
I drive an EMerc electric tractor unit and that does it as well
Driving though southampton docks i can pick up 3 different limits in 200 yards yet the road I'm on is 30mph

 

[Jaygee]

Yeah. It is an aid but does have its shortcomings. I have turned the warning chime off as it picks up 10mph speed limits facing sideways. from side roads in a 30mph road. I have mixed feelings about this. The chimes are annoying so turning them off defeats its purpose but we have bragging rights about the super powers of the camera it has.

 

[Simmocabs]

Hi quick question
Driving along a road the speed shows 30 mph on the satnav but speed on dash shows 20 and bonging over speed sound if I go over 20. Why different speeds showing ?

My MGS5 EV does the same thing. If there is no sign in the road to change from 20 to 30 (often where there is a time limited speed restriction at school opening and closing times, the camera doesn’t always recognise the change in speed restrictions.
Hope that helps?

 

[curiouskiwi]

Same problem here. The satnav appears to be a couple of years out of date for us. We had a lot of roads reconfigured in the last 2 years so the speed limits were adjusted. The dash recognition will read the road sign but then switch down to the speed it "thinks" it is, which is quite annoying when you're driving for 20 minutes on 100km/h road and it's forever beeping to say that the limit is 80km/h. (also, the satnav doesn't know about the new roundabouts that have been put in etc.)

Is this something I should raise with the dealer? I wouldn't expect a new car to be so out of date. I've been using CarPlay navigation instead, but that doesn't help with the dash notifications.

 

[Lovemyev]

Here in Wales they have switched a lot of the roads from what was 30mph down to 20mph.
At a cost of millions of pounds of tax payers money.
Now after a lot back lash, some of the roads have been moved back to 30mph.
Again, spend more money.
The car has a split personality, half of it thinks it should 30 while the other half thinks it’s 20mph !.
Constant bickering takes place every single trip.
The car would be spending more time at the dealer getting updated it, than driving it at this rate !.
You understand why people defeat these warnings because it drives them mad .
A small trip to our local supermarket today, will end up with a full on assault on my senses and hearing.
I need a lie down in quiet room and a headache tablet when we get back .
Basically the car is unable to keep pace with the frequent changes of road signage, it’s not the cars fault entirely.
It’s the Welsh governments lack ability to formulate a plan and then stick to it !.
They love to waste our money .