Well, some of the systems (eg, LED lights, static cornering lights) hook in to the GPS for some of their functions, so it wouldn't surprise me. Perhaps it does it if the GPS is there, and uses that as a backup method? As I say, I've not ever noticed it do this.
Isn't one day being able to use a car without needing a licence a good thing?
Steve: You'll get used to ACC soon enough. It has very few quirks, works remarkably well, and you'll soon learn the limitations and best uses of it.
and not trying to change gear the auto selector for starters, lol
I still end up trying to press the imaginary clutch down sometimes in our Golf GTi DSG - we've had it ages!
Sometimes mind just goes to sleep I think!
So 3 things have caused me to book the car into the dealer.
Gently sweeping dual carriageway, I was in the outside lane doing 77.1 mph (ahem) - stationary traffic ahead. The ACC did not see this (does not recognise stationary objects) and proceeds to try and continue going into stationary cars at 77.1 mph.
And twice now, I've had the "Pre Sense Fault, ACC unavailable" message in the DIS.
Service technician said that my sensor was dirty (please keep it clean at all times) and it was ever so slightly out of alignment. So he re-adjusted it, we shall see if that has cured it
Yes.
It was exciting.
I appreciate that ACC doesn't detect stationary objects (I said so as much in my second paragraph)
- but Pre Sense does, and was looking for experiences from others who did get a Pre Sense bing, alert, braking jolt etc. in a similar scenario, at high speed.
No, the wise thing is to know the limits of the system and use it within its capabilities to make your drive safer and easier.
Long periods of driving on motorways can make it hard to maintain concentration, This system seems to take away the requirement for so much concentration and too me would mean a driver is not as mentally alert as he should be.
If your not looking in front your probably not even looking behind you for that police car / ambulance coming up behind you or the guy in the white van who has been sitting on your bumper for 5 minutes trying to get you to move over.
Karl.
Agreed it's what I fear when the masses get this tech and forget to use their senses and brainSo what do you think those of us who are using ACC are doing instead of looking around, both front and rear, making sure we're aware of other traffic? We don't suddenly go into a trance just because we let an automatic system take some of the strain of maintaining a safe distance behind traffic ahead - and note that this safe distance is longer than the vast majority of drivers without ACC maintain. I'd hazard a guess that we're at least as aware of what's going on around us as someone without ACC. As i said above, it's always prudent to be aware of what's up ahead so that you can take over as necessary, and as cemerson said anyone using any system must be aware of its limitations and act accordingly.
So what do you think those of us who are using ACC are doing instead of looking around, both front and rear, making sure we're aware of other traffic? We don't suddenly go into a trance just because we let an automatic system take some of the strain of maintaining a safe distance behind traffic ahead - and note that this safe distance is longer than the vast majority of drivers without ACC maintain. I'd hazard a guess that we're at least as aware of what's going on around us as someone without ACC. As i said above, it's always prudent to be aware of what's up ahead so that you can take over as necessary, and as cemerson said anyone using any system must be aware of its limitations and act accordingly.
Pre-sense can warn you when you get close, but it will only work and bring you to a stop under a certain speed (19mph I think from memory).
Yes, if under 19mph, it will activate full autonomous braking, but above 19mph, it should do the "bing" thing, jolt the brakes, then still if no action from you, apply partial braking.
I was surprised that bearing down on the line of stationery traffic at 77.1mph, it didn't. Or maybe I wasn't brave enough to let it! Need a way to test this.
It isn't true but has the faint possibility of being true seeing it is from America.
Personally I don't even usually use cruise control let alone ACC , which I don't have.
I like to keep my attention on the road and what is going on, A lot of the time on the motorway I am looking at what is happening in front of the car I am driving behind, If I see traffic ahead slowing I am already ahead of what an ACC system can do as it's only looking at the gap to the vechicle in front. It won't help you when a deer or other animal appears at the side of the road to run out.
Long periods of driving on motorways can make it hard to maintain concentration, This system seems to take away the requirement for so much concentration and too me would mean a driver is not as mentally alert as he should be.
If your not looking in front your probably not even looking behind you for that police car / ambulance coming up behind you or the guy in the white van who has been sitting on your bumper for 5 minutes trying to get you to move over.
The last 10 seconds of this video is interesting. For legal reasons the Audi braking guard cannot employ full braking performance and it is imperative the driver maintains control of the vechicle.
For me cruise control is useful when going through speed controlled areas on a motorway, if it's 50 I set the cruise around 53 as the speedo reads high.
Karl.
That is the case because last week I was following a car quite slowly along a country lane and when he quite suddenly decided to turn right into a farm entrance and my Pre Sense put my brakes on a split second before I did. Perhaps as I get older my reactions are getting slower !!^ for the A3 range, Pre Sense is active regardless of whether ACC is active or not (in theory, needs testing!).
The system would need to have image recognition to distinguish between vehicles and random static objects to able be to slow down safely behind stationary motorway traffic otherwise there would be too many false alarms.