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Speed limit recognition.

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Discussion starter · #21 ·
Duncan said:
My 2020 Kona EV most definitely reads speed limit signs. Only today I noticed passing a side road that it picked up an errant 30mph sign that wasn't quite aligned correctly. In road work sections too it sometimes flips between the temporary 40/50 limit and the normal speed limit if there aren't enough repeaters for the restriction.
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To be honest I'm amazed!
What is happening with my car then? it's been zooming past some 'New' 50mph signs for at least 6 months on a regular basis and still saying i'm in a 60mph zone?
 
#22 ·
Daft Vader said:
To be honest I'm amazed!
What is happening with my car then? it's been zooming past some 'New' 50mph signs for at least 6 months on a regular basis and still saying i'm in a 60mph zone?
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Perhaps the camera isn't working on yours?

Today I noticed at the junction from M5 onto the M4 there was a 60mph limit on the overhead gantries. Before joining the M4 the car showed 60 from the gantries then as we pulled onto the M4 it switched to 70 and back to 60 at the first gantry. I also noticed going through a business park near home which is now all 20 limit with repeaters but the car's map still thinks it is 30 the displayed limit flipped 20 to 30 and back to 20. Whenever it starts a new road section in the map it seems to revert to the stored limit then at the next repeater it goes back to the limit from the road signs.
 
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#26 ·
Daft Vader said:
To be honest I'm amazed!
What is happening with my car then? it's been zooming past some 'New' 50mph signs for at least 6 months on a regular basis and still saying i'm in a 60mph zone?
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Does your car have the ISLW option? Is it enabled in the cluster menu?

John.
 
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#27 ·
My original understanding (probably wrong, yet again!), was that there were local beacons carrying the speed data that could be received by suitably equipped cars, that would show the local speed limit. Now it seems from the current comments, that this data is merely identified by the car's camera. Its a pity that it is apparently not possible to get a definitive answer to the question of the data's origin from the manual. [ISLW?]

Lawrence
 
#28 ·
Lawrence H said:
My original understanding (probably wrong, yet again!), was that there were local beacons carrying the speed data that could be received by suitably equipped cars, that would show the local speed limit. Now it seems from the current comments, that this data is merely identified by the car's camera. Its a pity that it is apparently not possible to get a definitive answer to the question of the data's origin from the manual. [ISLW?]

Lawrence
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Car manuals have always been useless for things like that as they include all options for all countries, so hard to figure out what actually applies to your car.
 
#29 ·
Lawrence H said:
My original understanding (probably wrong, yet again!), was that there were local beacons carrying the speed data that could be received by suitably equipped cars, that would show the local speed limit. Now it seems from the current comments, that this data is merely identified by the car's camera. Its a pity that it is apparently not possible to get a definitive answer to the question of the data's origin from the manual. [ISLW?]

Lawrence
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Hi Lawrence,
The navigation system has a database of speed limits for most A and B roads as part of its mapping system, and a further database of limits for local roads. It's up to the Highways Authority to set limits for A and B roads and your local council to set speed limits in "speed limit zones" and housing estates within their area, and it can take quite while for the powers that be to publish them. Your car will display limits from the databases if it has them for your current location or (- - -) if it doesn't.

If your car is equiped with ISLW or SLA, the car will display speed limits that the camera has read from road signs as you pass them . After a few hundred yards you will be shown the speed limit from the database again unless the camera has seen a repeat sign. This is why you may see 50mph in roadworks on the motorway change to 70mph then back to 50mph because the 50 signs are just too far apart!

Hope this helps

John.
 
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#34 ·
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#35 ·
Daft Vader said:
Hi I have had 3 Kona's now . A petrol premium sport, a SE hybrid an now the 2022 ultimate EV.
On all of these I have been told that the car uses camera's to read the Speed limit signs.
I am sure that this can't be true as I have noticed on many occasions that when new signs have been put up or they have been altered my satnav carries on telling me the old speed limit.
Has anyone else experienced this?

Mike
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My Kona Ultimate 2022 manual says that the camera at the top of the screen reads speed limit signs, but the Nav system also provides speed limit data for display. I don't know how priority is chosen. It also mentions Manual Speed Limit Assist (If fitted).
This Hyundai video explains that it is possible to choose to have the car speed controlled automatically (in America) to match the speed limit signs (or SatNav data). There is a further option to add or subtract 3 or 5 MPH. The option does not seem to be available in my English Kona, though the road signs are read and displayed. I have many times felt that the car does settle on 30MPH by itself when I immediately select cruise as I pull away BUT I can't be certain this is happening! I may be kidding myself.
Does anyone know if this function is available in UK?
(I usually set cruise to 33 in 30 MPH areas because ALL speedos show 30 when the speed is actually 27.)
 
#36 ·
I think the priority is simply whatever changed last: if you cross what the map data says is a speed limit boundary the car's idea of the limit changes, and if you pass a speed limit sign it updates to match the sign.
 
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#37 ·
Duncan said:
I think the priority is simply whatever changed last: if you cross what the map data says is a speed limit boundary the car's idea of the limit changes, and if you pass a speed limit sign it updates to match the sign.
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OK, but why can't my top-of-the-range UK Kona obey the speed limits (+3) automatically itself? :cry:
 
#38 ·
nuj51mron said:
OK, but why can't my top-of-the-range UK Kona obey the speed limits (+3) automatically itself? :cry:
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I think that's part of Highway Assist? But my 2020 Kona doesn't have highway assist so I can't help on that.
 
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#39 ·
Duncan said:
I think the priority is simply whatever changed last: if you cross what the map data says is a speed limit boundary the car's idea of the limit changes, and if you pass a speed limit sign it updates to match the sign.
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I'm not sure whether this is the case. When I start my Kona, it shows no speed limit at all. That suggests that it only updates when it sees a sign. I agree that it should know the speed limit for its location which in my case, is 30mph. To be fair, I never notice when it updates because I'm concentrating on entering the local main road. If I sit in the car and wait it does not update the speed limit.

Lawrence
 
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