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Thread: Active Cruise Control

  1. Default

    Quote Originally Posted by Kris14 View Post
    The radar cruise in my RS3 used to behave itself pretty well, but recently, it's been taking far too much notice of what's happening in adjacent lanes - both left and right, with unexpected slowing and braking of my car.

    Has anyone else noticed a change in theirs? I'm going to take it back to Audi because it's become a safety issue. I've already had one dope run up the back of me recently (not as a result of the radar cruise behaviour) and don't want any more.
    You may have shifted the alignment of the radar. As it forms part of the front bar, it will be affected by changes to the front bar position (usually if it gets caught on up curbs or steep driveways).

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    Kris14 (November 29th, 2018)

  3. Default

    Quote Originally Posted by jnrdavo View Post
    maybe obvious, but have you cleaned the sensors to make sure they are not getting 'blocked'?
    Is it just the large square sensor centre bottom of grill?
    Chalk: Mitsubishi Pajero 2008 manual

    Cheese: Audi 8V RS3 sedan

  4. #13

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    On the A3/S3/RS3, yes.

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    Kris14 (December 2nd, 2018)

  6. #14

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    2 points in the use of the ACC.
    - I have noticed my ACC won't overtake on the left lane, I think this was done / calibrated on purpose.

    - I am not sure in the use of the ACC in dense traffic, say 4 / 5 pm on the Monash freeway
    Let me explain:
    Offcourse you can set the distance, but even with the shorter distance, cars easily can cut in front of you, then you feel the car braking.
    With braking I am not sure the rear braking lights are shown, but I think it will.
    Then you will get the "braking wave" through rear traffic, in which the creation of a traffic jam earlier than needed.
    If I would be the person behind the car with the active ACC and you see a car cutting in front of the ACC car, then you will see the braking lights coming on the ACC car.
    My opinion would be, that person in the ACC car CAN'T drive by braking, instead of rolling the car out, in which you avoid a lesser "braking wave", so off the accelerator instead of braking, so the "braking wave" is less severe through rear traffic.
    I would be annoyed in the ACC car in front, and I would try to avoid that car by overtaking, and stay away from that car, so I would upset the flow of traffic too.

    The ACC is great for driving on less dense traffic roads in my opinion, so I usually with dense traffic I have the ACC off, thinking of traffic behind me in the behaviour of the ACC.
    B5 Avant '99 1.8TQ 132KW (AJL)...project car and L car for new student.
    3 pedal hobby.........Escort MK2 RS2000
    A4 B8 2.0 TQ S-line 2013 Manual
    Company car: Subaru Outback 2017 Diesel, and ....Manual

  7. #15

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    Interesting point with over taking from the left. I have noticed this lately while just sitting in the left lane of the great car park in the west (M4) where I'll pick up speed from my lane and the middle lane slows down. The ACC will maintain the speed of the vehicle to the right of me unless I over ride it. Not an issue sitting in the right lane or middle lane if traffic is slower from the left.
    Now I know what the go is I can adjust my driving and stop cursing this unpredictable ACC, because it is programmed to do that.
    FY Q5 TDI quattro sport with Technik package, Parking assistance package, Panoramic sunroof, Privacy glass and warm seats.

  8. #16

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    Just a quick note as well:
    If every car was fitted with ACC, and every car it was turned on, set on the minimum distance (minimum safety margins), the traffic jam will be longer.
    For every KM of road you will have fewer cars.
    I wonder when autonomous cars are arriving, and cars are driving in the "train", will the traffic jams be longer?
    Seeing though and feeling the technology of the ACC and reaction times, and cars will talk to each other in the future, the distance in between can be set shorter, so more cars for every KM of road.
    For now and the behaviour of the ACC, especially with sudden braking when cars are cutting in, or try to overtake in the left lane and the ACC is braking, I wonder how many rear enders will happen with drivers not paying attention.
    Therefore in the great car parks, I have the ACC off.
    B5 Avant '99 1.8TQ 132KW (AJL)...project car and L car for new student.
    3 pedal hobby.........Escort MK2 RS2000
    A4 B8 2.0 TQ S-line 2013 Manual
    Company car: Subaru Outback 2017 Diesel, and ....Manual

  9. Default

    Quote Originally Posted by Dutchi View Post
    Just a quick note as well:
    If every car was fitted with ACC, and every car it was turned on, set on the minimum distance (minimum safety margins), the traffic jam will be longer.
    For every KM of road you will have fewer cars.
    There's been a few experiments on wave theory as it relates to traffic jams - and yes while with the ACC cars will be further apart, you wouldn't have the traffic clearing.... everybody hits the accelerator... and then slams on the brakes and comes to a full stop when they hit the next patch of traffic and then repeats that process. The experiments I have read or seen on TV compare the normal fast/stop pattern we see, with one where everyone stays at a constant - slower - speed... and more cars get through a given space in the same time.

    Wave theory also explains why traffic jams are still going on for kilometers before an accident site even after the accident has cleared.

    Don't know how valid this is but check this site:
    http://trafficwaves.org/
    and this:
    https://phys.org/news/2007-12-traffi...maticians.html

    A friend who used to be in military transport used to talk about running convoys of 50 trucks with no stop/start because they agreed on the speed and distance... even with other cars around them.

    Of course in some parts of Australia the minimum one second ACC gap is just too much temptation for other drivers.

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    Dutchi (December 11th, 2018)

  11. #18

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    Thanks A3Fan, this is confirming if you are using the ACC in dense traffic, is a bad thing, and you could be the instigator of the start of a traffic jam.
    Last edited by Dutchi; December 11th, 2018 at 06:23 PM.
    B5 Avant '99 1.8TQ 132KW (AJL)...project car and L car for new student.
    3 pedal hobby.........Escort MK2 RS2000
    A4 B8 2.0 TQ S-line 2013 Manual
    Company car: Subaru Outback 2017 Diesel, and ....Manual

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