WARNING: crash risk ACC radar cruise control

[anonymousmoose]

WARNING: crash risk ACC radar cruise control

As it cant see STATIONARY objects it probably wont stop. Yes maybe eventually they will get it to see them but not in current models.

It's worrisome that people driving cars are not aware of how the technology works.

I remember a UK article with some older people having a go at the Tiguan because the bushes around their roads are were being picked up as objects by the collisions avoidance system and activated the brakes. The lady got so worried she stopped driving the car and the local news wrote an article.

It's happened to me before on a very narrow road, around vineyards. It takes 10-20 seconds to turn the system off. The journalist didn't do much research, the owners clearly didn't consult the manual.

It also reminds me of the idiots who drove into the sea at low tide because the sat nav apparently said so.

I love the tech in the Tiguan. It's just dangerous when people don't understand it's function like in the OP and adjust their driving behaviour to misperceptions.

[Nauend]

yeah, the ACC can’t see stationary objects, and will not react to people, animals or cars crossing the lane or coming towards you in the same lane. The front assist can detect some of these, between certain km/h ranges, but its full of limitations too. Maybe one day they will…….. but till then the driver needs to remain in control at all times.

[Guest001]

yeah, the ACC can’t see stationary objects, and will not react to people, animals or cars crossing the lane or coming towards you in the same lane. The front assist can detect some of these, between certain km/h ranges, but its full of limitations too. Maybe one day they will…….. but till then the driver needs to remain in control at all times.

Does react to car crossing as I had one pull out from side of the road and do a U turn right in front of me the first week I had my Passat in 2010. Bloody thing stopped dead before I could hit the brake and it was an earlier version of Front Assist. Some now have pedestrian avoidance as well including the Tiguans

[Nauend]

Does react to car crossing as I had one pull out from side of the road and do a U turn right in front of me the first week I had my Passat in 2010. Bloody thing stopped dead before I could hit the brake and it was an earlier version of Front Assist. Some now have pedestrian avoidance as well including the Tiguans

yeah the front assist will pick those up if you travelling within the speed range where the car will detect that. my car has put done the emergency braking once - it picked up the tail of a bus in the next lane as the bus swung out to turn a corner off the road - glad to have seen what it’s like when the car brakes with the red warning dash message, and happy to know it’s there (and hope I don’t need to experience that again!). My car has recently put on the brakes as I back out of the garage - still working through what I am doing or what the car is seeing for it to do that!

[Guest001]

yeah the front assist will pick those up if you travelling within the speed range where the car will detect that. my car has put done the emergency braking once - it picked up the tail of a bus in the next lane as the bus swung out to turn a corner off the road - glad to have seen what it’s like when the car brakes with the red warning dash message, and happy to know it’s there (and hope I don’t need to experience that again!). My car has recently put on the brakes as I back out of the garage - still working through what I am doing or what the car is seeing for it to do that!

If your driveway is sloped it could read the road as an impediment as it approaches it

[Suncoaster]

I have had my T-Cross stop dead at a drainage grate in the middle of a shopping centre car park. No big deal, but I thought that I had hit something at the time. Cheers-John

[Odin]

The radar that ACC uses is based on Doppler chirping radar. A characteristic of all Doppler radars is that they can only 'see' other objects when it has relative motion. Stationary objects are effectively invisible to Doppler. So it wouldn't have mattered if lanes were changed into the path of a stopped car, a brick wall, or a fallen roadside sign - they'd all be 'invisible' to the ACC's radar.

For a radar to detect a stopped car, and further discriminate against other harmless stationary roadside fixtures like armco barriers etc. would take some serious computing horsepower and a considerably more advanced radar to reliably achieve.

[Guest001]

The radar that ACC uses is based on Doppler chirping radar. A characteristic of all Doppler radars is that they can only 'see' other objects when it has relative motion. Stationary objects are effectively invisible to Doppler. So it wouldn't have mattered if lanes were changed into the path of a stopped car, a brick wall, or a fallen roadside sign - they'd all be 'invisible' to the ACC's radar.

For a radar to detect a stopped car, and further discriminate against other harmless stationary roadside fixtures like armco barriers etc. would take some serious computing horsepower and a considerably more advanced radar to reliably achieve.

Yeah those of us who have read and found that out know but most arent aware and therefore think its a fault The guy whose car stops because driveway probably slopes and it sees the perceived upslope of the road is stopping because the rear traffic alert is activated

[fatjoez]

The radar that ACC uses is based on Doppler chirping radar. A characteristic of all Doppler radars is that they can only 'see' other objects when it has relative motion. Stationary objects are effectively invisible to Doppler. So it wouldn't have mattered if lanes were changed into the path of a stopped car, a brick wall, or a fallen roadside sign - they'd all be 'invisible' to the ACC's radar.

For a radar to detect a stopped car, and further discriminate against other harmless stationary roadside fixtures like armco barriers etc. would take some serious computing horsepower and a considerably more advanced radar to reliably achieve.

Excellent contribution thanks Odin for clarifying.

Interesting that Tesla has switched to Camera based system rather than radar which will heavily increase the computing power required.

I expect mainstream radar tech and computing will accommodate stationary vehicles by 2025-30 since industry guidance is we will have full autonomous by then.

Sent from my Mi 9 SE using Tapatalk

[Nauend]

Yeah those of us who have read and found that out know but most arent aware and therefore think its a fault The guy whose car stops because driveway probably slopes and it sees the perceived upslope of the road is stopping because the rear traffic alert is activated

Nah it’s not my driveway - that’s flat. Am thinking the front assist has been picking up the side of the garage as I reverse out and turn slightly as I'm reversing.

Just read about chip Intel is developing that can do 176 trillion transactions per second to support the sort of decision making autonomous driving needs:intel's mobileye autonomous driving chip. there is also a good video on how the Waymo autonomous car operates and uses radar and cameras to self drive.