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Adaptive speed limiter?

2754 Views 29 Replies 7 Participants Last post by  gbt
Currently awaiting delivery of my ID4 and I'm just trying to suss out whether you can set the speed limiter to read the road signs/use mapping data to set the limit, similar to how it would for the ACC?
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Currently awaiting delivery of my ID4 and I'm just trying to suss out whether you can set the speed limiter to read the road signs/use mapping data to set the limit, similar to how it would for the ACC?
I have the Enyaq, based on the same platform, and this is the default behaviour. The speed limiter is not active by default, but it is set to adjust based on signs.
I have the Enyaq, based on the same platform, and this is the default behaviour. The speed limiter is not active by default, but it is set to adjust based on signs.
So you'd flick the limiter on, and it would then default to the signs rather than user input?
So you'd flick the limiter on, and it would then default to the signs rather than user input?
Yeah, that should work. Although it's worth noting that the speed limiter doesn't use regen to maintain speed downhill, it only prevents application of power.

I usually use the ACC for maintaining speed downhill as it does use regen.
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So you'd flick the limiter on, and it would then default to the signs rather than user input?
Yes, that's right. (Actually I'm not clear on when it uses signs and when it uses information from the mapping data.)

Please bear in mind that it is not perfect; the car often makes mistakes over the speed limit. For example there is a long stretch of 40 mph road near where I live where the car thinks that there are a couple of 30 mph sections. So, if using the speed limiter and driving at 40 mph you will find yourself unintentionally slowing down where the car thinks it has entered a 30 mph limit. Although you can override the limiter by using kick-down this is perhaps not always appropriate, and is not necessarily appreciated by any passengers. One alternative is to use the up (or down) arrow to adjust the limit but, particularly if there is traffic immediately behind you, perhaps the better option is to disengage the speed limiter then adjust the limiter setting and then re-engage it.

Rather a long, rambling, post, but the point I'm really trying to make is that you should practise engaging and disengaging the speed limiter so that you can do it quickly and reliably without needing to look at the steering wheel.
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Yeah, that should work. Although it's worth noting that the speed limiter doesn't use regen to maintain speed downhill, it only prevents application of power.

I usually use the ACC for maintaining speed downhill as it does use regen.
I hadn't realised this. I'm sure that the speed limiter does control speed when going downhill - are you saying that this is achieved by using the brakes rather than using regen?
can you see the green bar increase when it brakes under limiting? I've never tried it.
Although you can override the limiter by using kick-down this is perhaps not always appropriate, and is not necessarily appreciated by any passengers.
You don’t need to press kickdown to override an erroneous speed limit, merely press the accelerator gently to recover to whatever speed you desire.

Any passengers shouldn’t even notice.
I hadn't realised this. I'm sure that the speed limiter does control speed when going downhill - are you saying that this is achieved by using the brakes rather than using regen?
I originally read the manual for the Enyaq and thought it explicitly stated that the speed limiter does not control the vehicle speed and if you want it to slow down you need to use the brakes.

I have re-read the online manual (which may have been updated) and it is very unclear. The statement it makes is:

If the limit is exceeded when driving downhill, brake the vehicle with the brake pedal.
So maybe they are just talking about an exceptional circumstance where the regen wasn't able to hold to the limit because of a really steep hill?
You don’t need to press kickdown to override an erroneous speed limit, merely press the accelerator gently to recover to whatever speed you desire.

Any passengers shouldn’t even notice.
I think that only works with ACC. With the limiter the whole point is that it will prevent you going faster than the car thinks is the limit (unless you hard press).
I think that only works with ACC. With the limiter the whole point is that it will prevent you going faster than the car thinks is the limit (unless you hard press).
The hard speed limit function is separate though?

When ACC isn’t engaged, the cars camera reads the speed limit signs, or uses GPS mapping data, and sets a limit visible on the column display. If you’ve got predictive driving switched on then it will automatically slow for those limits, including holding the speed downhill. If you touch the accelerator though, you’re back in control and even if you don’t actually accelerate the car can gain speed downhill.

Perhaps there’s a bit of confusion here about ‘limiter’ as I believe that to be a set and forget number?
can you see the green bar increase when it brakes under limiting? I've never tried it.
I'll try and remember to have a look next time I go downhill with speed limiter engaged (I mostly use ACC so it may be a while before I check).
You don’t need to press kickdown to override an erroneous speed limit, merely press the accelerator gently to recover to whatever speed you desire.

Any passengers shouldn’t even notice.
According to a user manual "You can interrupt the speed limiter function at any time by fully depressing the accelerator beyond the point of resistance. As soon as the stored speed is exceeded, the green indicator lamp will flash and an acoustic warning may sound. The speed remains stored in the memory. The speed limiter function is activated again automatically as soon as the speed drops below the stored speed."
According to a user manual "You can interrupt the speed limiter function at any time by fully depressing the accelerator beyond the point of resistance. As soon as the stored speed is exceeded, the green indicator lamp will flash and an acoustic warning may sound. The speed remains stored in the memory. The speed limiter function is activated again automatically as soon as the speed drops below the stored speed."
Yes, that’s the ‘hard’ speed limiter that you can set to whatever limit you like.

I thought the OP was asking about whether the ID.4 reads and ‘obeys’ speed limits as it finds them, even outside of ACC, which it does as long as you also have predictive driving switched on. Those limits can be overridden via a slight pedal press.

It will always read speed limits and advise them on the small screen.
Yes, that’s the ‘hard’ speed limiter that you can set to whatever limit you like.

I thought the OP was asking about whether the ID.4 reads and ‘obeys’ speed limits as it finds them, even outside of ACC, which it does as long as you also have predictive driving switched on. Those limits can be overridden via a slight pedal press.

It will always read speed limits and advise them on the small screen.
The hard limiter by default follows the road signs too (but the limiter itself is turned off by default).
The hard limiter by default follows the road signs too (but the limiter itself is turned off by default).
Do you mean if you’ve got the hard limiter set?

I don’t ever use it, but just trying to clarify what info the OP was asking.
What is a speed limiter? Sorry I drive a Tesla 😉
Well I'm suitably confused 🤣

I suppose what I want it to do is just limit itself to the speed limits on any given road, without any intervention from me.

I can set a limiter now on my Leaf but it's user defined and although the speed limits will show up, it has absolutely no bearing on the limiter behaviour.
Well I'm suitably confused 🤣

I suppose what I want it to do is just limit itself to the speed limits on any given road, without any intervention from me.

I can set a limiter now on my Leaf but it's user defined and although the speed limits will show up, it has absolutely no bearing on the limiter behaviour.
So, if you jump in an ID car, it will automatically read and advise of speed limits via a symbol in the steering wheel display.

If you also have predictive driving on, which isn’t ACC although any ID will keep its distance from a vehicle in front, then it will slow or speed up automatically to comply with those limits. You can override it if necessary by just accelerating normally or braking respectively, no need for kickdown.

That’s the default behaviour, but you can also set a ‘hard’ limiter similar to your leaf, a sort of ‘do not exceed speed’, or you can turn it all off as you wish.
Well I'm suitably confused 🤣

I suppose what I want it to do is just limit itself to the speed limits on any given road, without any intervention from me.

I can set a limiter now on my Leaf but it's user defined and although the speed limits will show up, it has absolutely no bearing on the limiter behaviour.
I believe what you are asking for is an adaptive speed limiter that will do exactly as you have stated i.e. set your maximum speed to whatever the current posted speed limit is, and adjust (adapt) to subsequent changes there are (up or down).
I've found that some cars have it, but some only advise you with an audible warning, but I can't tell you if the ID4 has it or not, but I couldn't make it work on the Enyaq when I test drove it so I assumed it didn't have it (I use it constantly so it was the first thing I checked for on all my test drives).
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