43 minutes ago, rtj70 said:

I wonder if  like the Skoda TJA, there are two settings for lane assist. You can have the Skoda alert you that you are straying from lane or the active version that does the steering.

That isn't a TJA setting, that is a Lane Assist setting

A question if I may for current TJA users. If I enable ACC, LA and ALG before setting off, then (say on the motorway) engage ACC, will it automatically enter TJA with green lane markings etc? Really keen to understand TJA as it is a "must-have" for me and I want to test it on test-drive.

To use traffic jam assist you need to have all of those enabled and then actually set the cruise control speed by pressing the button on the end of the stalk. You can adjust the speed by moving the stalk up/down for 5mph steps and pull towards you or push the button again to increase/decrease in 1mph increments. You can do this when the car is stationary. When the car in front moves your car will move off. When they stop you will stop. When it recognises the lines it will also then steer. If you are stationary for tool long then resume by pressing the accelerator or pulling the cruise control stalk towards you.

 

TJA works up to a certain speed. Off the top of my head can't think what that is and the manual doesn't seem to mention it (pdf version page 242).

Brilliant thanks rtj70. And just to confirm my understanding:

- White lane markers = front assist is active

- Orange lane markers = LA + ACC enabled (with speed set as you say)

- Green lane markers = TJA (LA + ALG + ACC enabled (with speed set as you say).

Have I got that right? And does TJA show (green lane markers) even if you are travelling at motorway speed and not actually in a jam? Sorry to be so anal, but I will only get one shot at testing if buying used.

On my car with front assist active, the lane marks are always showing orange in the maxi dot display. They only turn green when:

 

- You have enabled traffic jam assist by settings a speed on the cruise control and the lane markings have been recognised

- You are driving at higher speeds (e.g. motorway or dual carriageway) and the lane markings have been recognised. It will do this even if ACC has not been set.

 

TJA does not operate at motorway speeds. ACC plus active lane assist will keep you in lane (if markings recognised) and keep you at the set speed or your set distance from the car in front. But that is not TJA.

Thanks rtj. I think it might be a long test drive!

Lane Assist works above 40mph for reference.

 

You cannot as such 'enable Traffic Jam Assist' - there are no separate settings for it - it is a function of the Lane Assist and Adaptive Cruise Control  combined that enables Lane Assist to remain active below 40mph if the correct conditions are met.

 

It is quite simple - in order for TJA to function:

Lane Assist is enabled and Adaptive Lane Guidance is enabled in the Lane Assist Settings

Adaptive Cruise Control is enabled

Vehicle speed drops below 40mph because ACC is tracking the speed of a vehicle in front

 

Under these circumstances, LA will remain active below 40mph.

It is the stop/Go function of ACC that brings the vehicle to a stop and starts it off again - that is not TJA.

 

I suggest you read up on it in the online user manual for the Superb before your test drive.

https://ws.skoda-auto.com/OwnersManualService/Data/en/Superb_3V/05-2017/Manual/Superb/B8_Superb_OwnersManual.pdf

 

Page 254:

Traffic jam assistant  Introduction WARNING ■ Please take note of the general points relating to the use of assistance systems » page 220, in section Introduction. ■ The driver must always have hands on the steering wheel and be ready to take over steering of the vehicle himself (accelerate or brake). Note The system is designed primarily for use on motorways. Function Read and observe on page 254 first. The traffic jam assistant (referred to as system) helps to keep the vehicle within the lane at speeds below 65 km/h while keeping the distance to the vehicle ahead. The system is only available for vehicles with Automatic transmission. The traffic jam assistant is an extension of the systems Lane Assist » page 251 and ACC » page 241 and works by using the functions of these two systems. For this reason, the chapters on System Lane Assist and ACC are to be read carefully and the safety notes are to be observed. Operating conditions Read and observe on page 254 first. The system activation occurs automatically whilst fulfilling the following basic conditions. Lane Assist with the adaptive tracking is enabled, the boundary lines on both sides are recognized lane » page 251. ACC is activated and the regulation » page 241 follows. The vehicle speed is below 65 km/h.

Active lane assist will work below 40mph if you turn on ACC (i.e. both make it TJA)... I've used it in stop start traffic and also just slow moving traffic.

Edited 21 November, 20178 yr by rtj70

12 hours ago, andyvee said:

The Audi system has 2 variants, one with Adaptive Lane Guidance, and one without.

 

It sounds like Adapative Lane Guidance was either turned off or not there ....

I did try to look for it but I couldn't find any adaptive lane guidance in the setting for the Audi. 

They do have "Traffic Jam Assist" though. once that kick in, it behaves like the skoda. 

On 21/11/2017 at 22:09, rtj70 said:

Active lane assist will work below 40mph if you turn on ACC (i.e. both make it TJA)... I've used it in stop start traffic and also just slow moving traffic.

Yes, that is the whole point of TJA - but that is NOT Lane Assist at that point. There are vehicles out there that have LA, ACC and DSG that do not have TJA.

Edited 23 November, 20178 yr by andyvee

Exactly.... Tried it today and with the minimum distance set it stopped a good half car length behind the car in front.

 

Not TJA related but will give the Superb a good run at the weekend I hope. We'll see how I like active lane assist being on - done for shorter journeys...

 

... so how does it detect fatigue via steering inputs if you're not steering?

14 minutes ago, rtj70 said:

Exactly.... Tried it today and with the minimum distance set it stopped a good half car length behind the car in front.

 

 

And that isn't TJA either ......

 

That is the Stop/Go part of ACC. You don't need a car with TJA for that to work, only ACC. You don't even need LA.

 

Confusing or what!

16 minutes ago, rtj70 said:

 

... so how does it detect fatigue via steering inputs if you're not steering?

Who knows!

 

From what I could tell on the O3 it senses you doing repeated steering corrections or hard braking.

 

It is an option I didn't spec on the Kodiaq as it was kind of pointless, I only ever saw it twice across 2 cars and 90k miles!

I have it because I wanted some of the other stuff it came with to be honest. I don't care if what I refer to is TJA or just standard ACC. It was steering and moving me in traffic... had it not had lane assist then it would not have followed the bends in the road :-)

13 minutes ago, andyvee said:

Who knows!

From what I could tell on the O3 it senses you doing repeated steering corrections or hard braking.

 

But if you're not steering then it cannot detect steering corrections. If on cruise control with ACC not likely to be braking.

 

On my previous Audi A3 it did pick up on when I was due a break.... but sometimes it was saying this soon after starting a journey. Previous to that the Passat CC was the same.

 

These systems use steering input to detect your fatigue.... steering assist therefore cannot...? Although you might not know you were fatigued and this might help you?

I suspect this is completely irrelevant, but the last fatigue detector I had was on a '97 A6 Audi. It just told me I had been driving for 2 hours and I should consider taking a break. No intelligence at all. Are they better now?

They are I think.

19 minutes ago, rtj70 said:

I have it because I wanted some of the other stuff it came with to be honest. I don't care if what I refer to is TJA or just standard ACC. It was steering and moving me in traffic... had it not had lane assist then it would not have followed the bends in the road :-)

Yes, but there is a lot of confusion as to what TJA actually is, and plenty of posts where people are referring to other functions and calling them TJA

17 minutes ago, rtj70 said:

 

But if you're not steering then it cannot detect steering corrections. If on cruise control with ACC not likely to be braking.

 

On my previous Audi A3 it did pick up on when I was due a break.... but sometimes it was saying this soon after starting a journey. Previous to that the Passat CC was the same.

 

These systems use steering input to detect your fatigue.... steering assist therefore cannot...? Although you might not know you were fatigued and this might help you?

You cannot drive for 2 hours without steering, it isn't a Tesla or a Google car.

 

It will warn you to take over the steering at approx 20mph, and if you take your hands off the wheel at highway speeds it will sense that as well. Whether you know it or not, you are making steering inputs even with LA enabled.

 

The fact that you have had 2 cars that say you need a break soon after starting is probably not something to brag about  as your car has detected erratic driving!

 

I take it you just drive straight through red traffic lights, over roundabouts and don't give way at junctions then after engaging ACC if you are not using the brakes?

I am still playing around with mine, I have the rear blind spot so I assume I have lane assistant. 

The ACC is OK and works fairly well but it doesn't look far enough ahead. It doesn't ease of the accelerator when traffic ahead is slowing. It is very reactive and not proactive. 

I am not sure if the lane assistant works well, not fully used yet, as it also seems to be reactive so it is too late to adjust smoothly and gets to the line before an adjustment is made. Will it start to 'Zig Zag?

1 hour ago, andyvee said:

You cannot drive for 2 hours without steering, it isn't a Tesla or a Google car.

You only need to apply resistance to the steering - so unfortunately you can drive for longer than the 12 seconds it warns about with little input. And Tesla does not have autonomous cars in public use yet - the first with level 5 autonomous driving is probably going to be an Audi A8.

 

Quote

It will warn you to take over the steering at approx 20mph, and if you take your hands off the wheel at highway speeds it will sense that as well. Whether you know it or not, you are making steering inputs even with LA enabled

You need only hold the steering very lightly - I'm only experimenting and not wanting it to drive itself! Just curious how far it will go. But you need LIDAR (more than one) to map out the road ahead for autonomous driving with the computing power/neural networks to make decision. You seem to imply I am an idiot and yet I have a masters in computer science including AI and neural networks :-)

 

Quote

The fact that you have had 2 cars that say you need a break soon after starting is probably not something to brag about  as your car has detected erratic driving!

 

Smooth driving on motorways - straight line. You can apologise.

 

Quote

I take it you just drive straight through red traffic lights, over roundabouts and don't give way at junctions then after engaging ACC if you are not using the brakes?

 

I take it you are obnoxious and deliberately being stupid/insulting. You can apologise.... your post has been reported.

 

Of course I don't do that. Who does.  But on a 100+ mile  motorway journey there are no roundabouts or junctions. And ACC might mean you don't need to touch the brakes.

Edited 23 November, 20178 yr by rtj70

17 minutes ago, vfrvrs said:

It is very reactive and not proactive. 

 

It is and on the few occasions when I've tried it out of curiosity I thought it would not brake (I was ready). It brakes late. If I was driving I'd coast and if in E mode it would be coasting for real and saving fuel.

 

As I've said I only have it because it's part of the Smart Light Assist package and I wanted smart light assist, blind spot monitoring and rear manoeuvre assist (whatever it's called)... so curious what it can do. Not even a Tesla can do autonomous driving on roads (yet) because it's not been approved. But a Tesla has lots of LIDAR cameras and a Skoda does not. So this is a simple system.

 

And even a Tesla has driven into the side of a truck because LIDAR did not detect the threat whereas that car's RADAR would have done but the other systems ignored the information from the forward RADAR sensor.

Edited 23 November, 20178 yr by rtj70

This demo shows active lane assist is not good enough really but the 12s hands-off timer can be overcome:

 

 

Of course I must do this all the time including through red lights and over/through roundabouts :-)

Edited 23 November, 20178 yr by rtj70

11 hours ago, vfrvrs said:

 

The ACC is OK and works fairly well but it doesn't look far enough ahead. It doesn't ease of the accelerator when traffic ahead is slowing. It is very reactive and not proactive. 

This is interesting. Complete guess on my part, but what distance from the car in front do you have set on the ACC? Does the response change if you increase it? (BTW I know I'm asking you to teach me to swim by describing it, which is of course impossible :-)

 I am grateful for the responses though.) 

19 hours ago, rtj70 said:

You only need to apply resistance to the steering - so unfortunately you can drive for longer than the 12 seconds it warns about with little input. And Tesla does not have autonomous cars in public use yet - the first with level 5 autonomous driving is probably going to be an Audi A8.

 

You need only hold the steering very lightly - I'm only experimenting and not wanting it to drive itself! Just curious how far it will go. But you need LIDAR (more than one) to map out the road ahead for autonomous driving with the computing power/neural networks to make decision. You seem to imply I am an idiot and yet I have a masters in computer science including AI and neural networks :-)

 

 

Smooth driving on motorways - straight line. You can apologise.

 

 

I take it you are obnoxious and deliberately being stupid/insulting. You can apologise.... your post has been reported.

 

Of course I don't do that. Who does.  But on a 100+ mile  motorway journey there are no roundabouts or junctions. And ACC might mean you don't need to touch the brakes.

12 secs is a bit different to 2 hours.

Well done on your qualifications. Unfortunately you don't know my level of education and I fail to see the relevance.

Why should I apologise, there was a smiley in the sentence, get a sense of humour. I did not imply you were an idiot, you have inferred that.

I was not being obnoxious or stupid. Seeing as you are now directly calling me stupid I shall ask you to apologise as that is a direct insult. Thank you for reporting my post.

'might mean you don't have to touch the brakes' - is that not a contradiction of your earlier statement?

 

Anyway, all off-topic and irrelevant to TJA.