I have a question which i could not find an exact answer although i searched the user manual and internet.

If the driver does not brake himself for some reason like carelessness or a health problem etc. what does ADAS do especially in some specific circumstances?

Let's say, the car is moving at certain speed and approaching to a stationary car for example at the traffic lights. Will ADAS or any element of the system intervene and brake itself and stop the car?(Of course I know that driver should not totally depend on any safety element and always should hold the control himself)

But, i think that if the system is supposed to intervene there should be some rules, parameters and conditions on which the system will work. For example, at least there should be a value for the speed according to which system decides to intervene or not.

Thank you in advance.

In the circumstance you describe while vehicle is travelling above a trigger speed, the ADAS system will detect the possibility of a collision and give an audio-visual warning on the instrument, if the driver does not respond by applying braking force, the ADAS will instigate full emergency braking - Critical, very strongly advise that this is not tested! - It is in no way to be relied on as any form of autonomous control.

19 minutes ago, Warrior193 said:

In the circumstance you describe while vehicle is travelling above a trigger speed, the ADAS system will detect the possibility of a collision and give an audio-visual warning on the instrument, if the driver does not respond by applying braking force, the ADAS will instigate full emergency braking - Critical, very strongly advise that this is not tested! - It is in no way to be relied on as any form of autonomous control.

You are right, the system should not be relied on, as i said "Of course I know that driver should not totally depend on any safety element and always should hold the control himself".

Actually i want to learn the conditions and limitations such as the speed, distance etc.(at which speed the system starts to operate and above which speed system does not operate)

Thank you for contribution.

According to information on the VAG website, front assist is operational from approx. 5kph up to 210kph.

According to the same source, the distance (vehicle spacing) warning is operational from 30kph to 210kph.

3 hours ago, enoktakenokta said:

Actually i want to learn the conditions and limitations such as the speed, distance etc.(at which speed the system starts to operate and above which speed system does not operate)

Described above the boundaries of engagement of the system, but what it cannot be "predicted" is when the reaction will occur, since it depends on speed (both of the vehicle and relative to the other vehicles), distance to close objects, etc.

I have had situations in which the system gave the warning "Brake!" when close to other vehicles at speed, but some other times in similar situations it hasn't, so there must be some calculations that the computer makes before taking action.

The total complete and utter stop I have only experienced in manouvering, the first time was the first ever drive ... I put reverse getting it out of the tow truck that brought the car and a guy dashed right behind me, beeps and blinks and the car just squatted down and stop ... it was love at first moment 🥰

I had on the summer a funny situation, I had a parking cell on a place where i had a steep ramp to go, while at the same time negotiating a 90 tight turn, all in reverse, but with 2-3 corrections forward as needed. Superb-a was not liking it at all ... I had to disable the parking system every time I flick in R.

Is good to know car has some form of self-preservation ... just to stay like that and don't go Skynet on me and "terminate" the driver when he makes silly manouvers 😁

8 hours ago, enoktakenokta said:

Let's say, the car is moving at certain speed and approaching to a stationary car for example at the traffic lights. Will ADAS or any element of the system intervene and brake itself and stop the car?

It most definitely will NOT brake!!

Trust me, I know, whilst doing 80 km/h towards a car already stopped at the lights!!

ACC relies on a moving reference target (in the same direction and lane as u r travelling in) to determine if it needs to slow down.

A stationary object (car stopped at the traffic lights) will NOT tell the ACC on ur car to slow down gracefully.

Instead it will scream "BRAKE!" at u, and then hit the stationary car/object that was stopped at the lights....if u don't react on time jumping on ur brakes!!

Manoeuvre Assist (available from MY18 onwards) will actually stop u from hitting something, but only works at below a certain speed, i.e. parking speeds.

It won't stop u when travelling at normal speeds on the roads.

Edited 1 September, 20251 Sep by JR RS

I am not sure whether it is the acc or front assist which operates on circumstances like this. As @JR RS said i do not think that acc or front assist cannot prevent a crash in that situation.

But, I saw another info in the forum which says emergency brake is operational up to 60 kmph while approaching to a stationary object and automatically operates and bu brakes.

Which safety assistant is responsible in this situation, i am not sure. Also the speed values are very different for systems to operate.

As per others, I have several times had the car slam the brakes on to bring me to an instant stop when reversing and (in my opinion) way too far from the object it thinks you're going to hit.

That said, it does seem to be speed-sensitive, so I assume the software does a calculation and decides I will hit this object in x.x seconds. It doesn't know I will be braking myself before I hit the object.

What the car really does not like is when I am using ACC and it sees a car to the left (parked) while on a bend. It frequently slams the brakes on in those situations, to the concern of the driver behind, to the point I have long since acquired some muscle-memory whenever I am on non-motorway etc doing slower speeds and have stationary traffic that I know will be problematic to the ACC and so I switch it off until I am past.

13 hours ago, JR RS said:

It most definitely will NOT brake!!

Trust me, I know, whilst doing 80 km/h towards a car already stopped at the lights!!

ACC relies on a moving reference target (in the same direction and lane as u r travelling in) to determine if it needs to slow down.

A stationary object (car stopped at the traffic lights) will NOT tell the ACC on ur car to slow down gracefully.

Instead it will scream "BRAKE!" at u, and then hit the stationary car/object that was stopped at the lights....if u don't react on time jumping on ur brakes!!

Manoeuvre Assist (available from MY18 onwards) will actually stop u from hitting something, but only works at below a certain speed, i.e. parking speeds.

It won't stop u when travelling at normal speeds on the roads.

OP was asking about Front Assist - not ACC. He has located Front Assist data regarding engagement speeds.

I've had the "brake" alert on the dashboard a couple of times, most recently on the motorway when the car in front slammed on the brakes (full emergency breaking from 70mph, indicators flashing etc for no apparent reason). There was a LOUD beep and the warning but I was already covering the pedal so I braked rather than the car.

I've had a couple of low speed parking manevour instances where it seems a bit sensitive but notthing terrible.

10 hours ago, Gax said:

What the car really does not like is when I am using ACC and it sees a car to the left (parked) while on a bend. It frequently slams the brakes on in those situations, to the concern of the driver behind, to the point I have long since acquired some muscle-memory whenever I am on non-motorway etc doing slower speeds and have stationary traffic that I know will be problematic to the ACC and so I switch it off until I am past.

U can stop it from doing that permanently by disabling "Overtaking Right Prevention" using OBDEleven or VCDS.

Edited 2 September, 20252 Sep by JR RS

I watched videos which was broadcasted by ADAC. One of the tests’ aim was to test if the tested car approaching to the stationary car can stop the car automatically or not.

It was obvious that they tests the AEB system. Their test speed was 50 kmph.