ACC auto speeding.

[Westy]

Keep an eye out for old Severn bridge folks! Enyaq (and other cars I’ve seen) happily doing 60-70mph and then it picks up the 15mph sign that’s on the side of the bridge for mopeds (lane off the side of the bridge) and try’s to slow you to 15mph on a 70mph road.

Having it happen to me once I tun the ACC off for the bridge and back on other side.

In truth its a bit unfair on the car as the 15mph sign is clearly visible and runs alongside - but its an example of signs needing to be moved for new technology

[Goaty]

It’s not always a sign mis-read that causes the Enyaq to suddenly slow (when using ACC or speed limiter).

There’s a 40mph road near me where ACC slows me to 30mph in the middle of it for no reason- there are no signs there for it to misread. It does this without fail every time, in both directions. Obviously being aware of it now, I can react in advance.

I recall there may have been some roadworks along that particular road many years ago and perhaps there was a temporary speed restriction at that point which has somehow made its way into the satnav’s speed database?!

[scratch113]

Keep an eye out for old Severn bridge folks! Enyaq (and other cars I’ve seen) happily doing 60-70mph and then it picks up the 15mph sign that’s on the side of the bridge for mopeds (lane off the side of the bridge) and try’s to slow you to 15mph on a 70mph road.

Having it happen to me once I tun the ACC off for the bridge and back on other side.

In truth its a bit unfair on the car as the 15mph sign is clearly visible and runs alongside - but its an example of signs needing to be moved for new technology

I rest my case - new cars launched after July next year won't just have the speed limit as part of an ACC system, thereby giving the driver the choice to disengage it, the speed limiter will be built in and active all the time!

On that basis, you'll have lots of new cars crawling their way across the Severn bridge at 15mph, or maybe it will let you get up to 20 before the car starts taking action to reduce your speed back to what it thinks the limit is...

Oh joy!

Unless you have faith that the car industry will somehow magically remove all of those 'ghost' roadworks limits that are programmed unseen into their satnav systems whilst every local Council will also complete a survey of all road speed signs in their area to ensure they won't inadvertently apply an incorrect limit. And all of this completed in the next 6 months!

Not likely, but the regulation is coming anyway...

[ChangoMutney]

I don't have mine yet and I've never owned a car with ACC so not familiar with how the various systems work or kick in. I have ordered the Assisted Drive Package Plus package, so will have the travel assist feature. If I'm on a motorway and following a car/lorry at 60mph (at the distance I've speicified), could the car suddenly slow to 30 if it sees or misreads a sign, even if the vehicle ahead continues at 60mph? I don't quite understand at the moment when it uses speed limits and when it uses distance to the vehicle ahead and how the two different scenarios are related.

[Goaty]

I don't have mine yet and I've never owned a car with ACC so not familiar with how the various systems work or kick in. I have ordered the Assisted Drive Package Plus package, so will have the travel assist feature. If I'm on a motorway and following a car/lorry at 60mph (at the distance I've speicified), could the car suddenly slow to 30 if it sees or misreads a sign, even if the vehicle ahead continues at 60mph? I don't quite understand at the moment when it uses speed limits and when it uses distance to the vehicle ahead and how the two different scenarios are related.

Rest assured that it doesn’t slam the brakes on like someone noticing the Police parked up in a lay-by would at the last minute, if they know they’re speeding

It’s a more gentle slow-down and all you have to do to cancel it is just accelerate manually (or brake manually if the system has sped up where you’d rather it hadn’t).

ACC is a brilliant system on the Enyaq but just keep your foot handy and ready to take over. There is a comfortable footrest to the side of the accelerator.

[ChangoMutney]

It’s a more gentle slow-down and all you have to do to cancel it is just accelerate manually (or brake manually if the system has sped up where you’d rather it hadn’t).

So it will maintain the specified distance as long as that doesn't contracdict what it understands the speed limit to be. In my example, it will start to slow down because it understands the limit is now 30 rather than 70 (but you can override it).

If the car thinks it is in a 70 area and you're following a car doing 60, then pull out into a clear lane, the car will accelerate to 70 but no more. If you come up behind another vehicle doing less than 70 it will resume its set distance again. If the vehicle ahead accelerates to 80, the Enyaq will only accelerate to 70 but no more.

Have I got that right?

[Goaty]

/\ exactly

If the car in front goes faster than the speed you’ve set, then your car will maintain your set speed whilst the car you’re following pulls off into the distance.

If that car then slows down to below your set speed, you’ll catch it up but will then maintain a decent distance behind it whist you slow down to its speed.

You have 5 distance settings and they all seem to leave a good safe gap.

[ChangoMutney]

Thanks, I've been wondering about that for a while.

[Chris__M]

And this highlights everything that's wrong with the EU's plan to introduce mandatory speed limiters on all newly launched models from July next year.

The mandatory functionality required is for speed limiters, not cruise control. You are still in control of your speed and responsible for keeping it under the posted limit.

[Chris__M]

On that basis, you'll have lots of new cars crawling their way across the Severn bridge at 15mph, or maybe it will let you get up to 20 before the car starts taking action to reduce your speed back to what it thinks the limit is...

Even mandatory speed limiters can be temporarily over-ridden by depressing the gas pedal past a certain point. Of course, the driver does this knowing they are over-riding a safety measure (the pedal gives a little more resistance than usual at that point), and are still fully responsible for the speed they are travelling at.

I used a speed limiter regularly in my previous car, and had no problems.