17 hours ago, neil3k said:

ACC is super useful on my 70 plate superb

 

Will actually bring you to a stop at a roundabout for example if the car in front has stopped and will move you off again.

My model doesn't have ACC. The standard non-ACC cruise control is fitted.

17 hours ago, D402 said:

@FyllCeeFront Assist does seem to be working - the 'you're too close to the car in front' indicator you've seen is the first level of warning and proves your radar sensor is working - level two is a chime and message 'Apply the Brake!'; level three is an automatic brake application which can be late and very harsh.

 

Your experiments with the box will have triggered the automatic braking for low speed manouevres that uses the parking sensors and works up to 8km/h, the radar sensor won't see a stationary box.

Right . . . .  that clears that up. There are no front stationary object sensors  (ultrasonic? as apposed to Radar)  installed on my car and no digital display of warning bars for objects in front, like when I reverse up to an object. So the cardboard box test for frontal collision at low speed won't work.  I do have a front Radar sensor fitted though. 

OK that means then that the radar operated Front Assist for automatic braking at high speed (30 to 210 km/h) when a collision is about to happen is far smarter than I imagined! and has nothing to do with ACC which I don't have fitted.  I'm guessing it is activated when the calculation of the RATE OF CLOSURE  between my vehicle and the moving vehicle in front exceeds a certain threshold, a threshold that is set according to my actual speed plus the distance to the moving vehicle in front plus the speed of the moving vehicle in front plus the time it will take for me to stop (which could change in different weather conditions). Can anyone confirm if I am on the right track and this is in fact how it works?        

 

If I am right then there is no way an average driver can test it out to see if it is working because it operates in zone where a collision is about to happen, I mean REALLY REALLY imminent!  

I want to know whether ACC is good at using engine braking to slow down, or whether it's hitting the brakes, because much as I like the ACC system which is on my car, I can't bear the thought of it constantly driving up to traffic ahead and hitting the brakes when as a manual driver I almost never need the brakes on a motorway, I consider it poor driving and I dislike the notion of looking like a bad driver who hadn't the basic foresight to see that there was traffic ahead and slow in time without the need for brakes. Does anyone know how good ACC is at avoiding unnecessary braking? I've not had the opportunity to drive behind my own car to watch it in action. 

I would imagine when following traffic that’s slowing gently it probably just backs off the throttle like you would traditionally do and probably does not actually show the brake lights but if it needs to then it definitely does brake by itself. One good example I can think of is when trying to get into lane 1 from lane 2 on a busy motorway in front of a lorry with a big enough gap - I indicate and pull in still on cruise but then it decides the gap to the car in front is too small so it brakes and then I get flashed from behind by the (clearly annoyed) lorry driver who thinks I’m brake testing him. Obviously not my intention but there’s not much you can do in that situation except disengage cruise before such a move and then gradually slow down to keep a safe gap in front and behind.

On 17/02/2021 at 21:55, AlVal said:

I want to know whether ACC is good at using engine braking to slow down, or whether it's hitting the brakes, because much as I like the ACC system which is on my car, I can't bear the thought of it constantly driving up to traffic ahead and hitting the brakes when as a manual driver I almost never need the brakes on a motorway, I consider it poor driving and I dislike the notion of looking like a bad driver who hadn't the basic foresight to see that there was traffic ahead and slow in time without the need for brakes. Does anyone know how good ACC is at avoiding unnecessary braking? I've not had the opportunity to drive behind my own car to watch it in action. 

I find that my car leaves it too late to slow behind a slower car. It arrives at speed then plus the brakes on. I find my pulse quickening as we close on the car on front!

Also going downhill I can hear the brakes being applied when I would have backed off the throttle about a quarter of a mile back.

It's a very clever system but it can't anticipate the traffic like we can.

15 hours ago, facet edge said:

I find that my car leaves it too late to slow behind a slower car. It arrives at speed then plus the brakes on. I find my pulse quickening as we close on the car on front!

Also going downhill I can hear the brakes being applied when I would have backed off the throttle about a quarter of a mile back.

It's a very clever system but it can't anticipate the traffic like we can.

You know you can adjust the distance? What distance are you set at? 

On 20/02/2021 at 13:58, AlVal said:

You know you can adjust the distance? What distance are you set at? 

Yes, I have it set on furthest. If the traffic starts to bunch and stop it still will close in too much before braking in my opinion.

The other problem is when a car pulls out of your lane it then takes an age to decide that it's clear and accelerate. 

Try setting ACC to Eco in the Individual drive mode settings, it backs off much sooner then and rarely needs to brake.

On on of the setting (not sure how I get to it) the maxidot shows if there is a car in front on the maxidot (think it may be select Driver Assist on the maxidot and one of the option there)

 

This is always on - not only when the ACC is active (think the car is white when ACC on, and outline if not)

 

It doesnt always "see" the car in front though. The same happens with ACC - sometimes it doesnt detect and would run into it, if you didnt brake.