Traffic Sign Recognition and Adaptive Speed Limite
- Thread starter Mikekin
- Start date
relaxitscool
New member
https://www.ownerinfo.jaguar.com/document/2R/2019/1391850/proc/G2085167/G2161199?vin=SAJDB1AX7KCK58063
Seems a lot of faff tbh.
Regards
Rob
Seems a lot of faff tbh.
Regards
Rob
Given the way sign recognition and adaptive speed limiter work, I'd be turning them off (as I did). The idea is that the cameras detect the speed-limit signs and adjust the speed limiter accordingly. The problem occurs when :
1. The maps database (here.com) that Jaguar uses has incorrect data entered, so the car decides that the road you are on is a different limit to the actual one
and
2. The car sees speed signs on a road ahead of you that also happens to be from a junction, and therefore not one you are driving on - very common when the junction is off a sharp bend and that side-road has a new speed limit on it.
In a 3-mile journey to my nearest town, the 'super intelligent systems' on both the cars on our drive decide that
a) It's a 30mph limit when it's a 60
b) It's a 40mph limit when it's a 60, because of a 40mph limit on a road that is OFF the road I'm on
c) It's a 30mph limit when it's a 60, because the council mistakenly put up a single 30mph limit sign on a side-road, but where there isn't a 30-limit anyway, but the car's cameras pick it up and decide that must be the limit
A friend of mine has a VW that is forever deciding the speed limit is something other than the correct one - regularly reducing the speed to 5mph due to an adjacent factory road, or occasionally deciding to convert mph to kph and setting the cruise control to that speed in mph. In an electric car, he has regularly found himself doing well over 80mph before he's had a chance to even think about cancelling cruise.
One day, they might get it all working, but in the meantime it is beyond ridiculous that this is allowed (mandated even, on newer cars) on cars that are on our roads.
EDIT: I should add, I like the idea of it and I would use it IF it worked properly.
EDIT: I also wouldn't get too excited about alterations to the here.com databases quickly appearing in the Jaguar map updates. I corrected the incorrect 30mph limit on the long stretch of road to town over 3 months ago and it still hasn't made it's way into the latest maps from Jaguar.
1. The maps database (here.com) that Jaguar uses has incorrect data entered, so the car decides that the road you are on is a different limit to the actual one
and
2. The car sees speed signs on a road ahead of you that also happens to be from a junction, and therefore not one you are driving on - very common when the junction is off a sharp bend and that side-road has a new speed limit on it.
In a 3-mile journey to my nearest town, the 'super intelligent systems' on both the cars on our drive decide that
a) It's a 30mph limit when it's a 60
b) It's a 40mph limit when it's a 60, because of a 40mph limit on a road that is OFF the road I'm on
c) It's a 30mph limit when it's a 60, because the council mistakenly put up a single 30mph limit sign on a side-road, but where there isn't a 30-limit anyway, but the car's cameras pick it up and decide that must be the limit
A friend of mine has a VW that is forever deciding the speed limit is something other than the correct one - regularly reducing the speed to 5mph due to an adjacent factory road, or occasionally deciding to convert mph to kph and setting the cruise control to that speed in mph. In an electric car, he has regularly found himself doing well over 80mph before he's had a chance to even think about cancelling cruise.
One day, they might get it all working, but in the meantime it is beyond ridiculous that this is allowed (mandated even, on newer cars) on cars that are on our roads.
EDIT: I should add, I like the idea of it and I would use it IF it worked properly.
EDIT: I also wouldn't get too excited about alterations to the here.com databases quickly appearing in the Jaguar map updates. I corrected the incorrect 30mph limit on the long stretch of road to town over 3 months ago and it still hasn't made it's way into the latest maps from Jaguar.
A
Anonymous
Guest
Our other car also has this issue.
There is a road that is 40mph that changes to a 30mph for a long left hand corner as you enter a built up area but on the right hand side is an entry to an industrial estate with a sign post that says 5mph.
The car picks up the 5mph sign as you turn the corner until it realises you have remained on the 30mph road.
A good idea in principle but it has it's flaws.
There is a road that is 40mph that changes to a 30mph for a long left hand corner as you enter a built up area but on the right hand side is an entry to an industrial estate with a sign post that says 5mph.
The car picks up the 5mph sign as you turn the corner until it realises you have remained on the 30mph road.
A good idea in principle but it has it's flaws.
Lady Eleanore
New member
So this might seem a bit obvious to many (most) of you, but I just discovered a thing.
I use the speed limiter a lot, usually in road works and speed camera striven motorways, but I never bothered with the adaptive thing, figuring it would be too much faffing about with software nonsense.
Anyhoo, it turns out if you give the Can (cancel) button a long press it swaps from regular speed limit, to adaptive speed limit and furthermore, by using the speed adjust buttons for the limiter, you can add up to 6mph to the adaptive limit. ie, you hit the motorway, the car sets the auto-limit for 70mph, but you have already added 6mph to that figure which it remembers. You then enter a 50mph zone and the car auto sets the limiter to 56mph and so on.
It was quite a nice surprise, really. Maybe I should RTFM
Btw the car is an R75
I use the speed limiter a lot, usually in road works and speed camera striven motorways, but I never bothered with the adaptive thing, figuring it would be too much faffing about with software nonsense.
Anyhoo, it turns out if you give the Can (cancel) button a long press it swaps from regular speed limit, to adaptive speed limit and furthermore, by using the speed adjust buttons for the limiter, you can add up to 6mph to the adaptive limit. ie, you hit the motorway, the car sets the auto-limit for 70mph, but you have already added 6mph to that figure which it remembers. You then enter a 50mph zone and the car auto sets the limiter to 56mph and so on.
It was quite a nice surprise, really. Maybe I should RTFM
Btw the car is an R75
cj10jeeper
New member
The problem with this system as described by several above is even more acute if you drive in Spain. They have progressive speed decreasing speed limits on exit slip roads, typically down from 100/120, to 80 then 60 kph. The system reads these perfectly as it's almost parallel to the main carriage. You then often have your own or car braking or the one in front seemingly brake testing you. I'd go as far as to say the system is outright dangerous..
On my other car in the UK it's quite dangerous. With full regenerating single pedal driving, the rate of slow down for an error reading a sign is astounding..
On my other car in the UK it's quite dangerous. With full regenerating single pedal driving, the rate of slow down for an error reading a sign is astounding..
MajorTom
New member
Agreed, overall the concept of traffic sign recognition based automatic speed limitation is just too flawed and too dangerous. Can't believe that they pushed through with the mandatory traffic sign recognition based speed warnings on new cars given how bad it works in practice.
I use the cruise control a lot on longer runs but think I only tested this adaptive feature once or twice in my F-Type. I've just set up the traffic sign recognition based speed warnings to flash a circle around the speed limit sign in the dash, which I think is useful because it gives me a gentle hint when the car thinks I'm over the speed limit but without any intrusive noise or actual braking.
I use the cruise control a lot on longer runs but think I only tested this adaptive feature once or twice in my F-Type. I've just set up the traffic sign recognition based speed warnings to flash a circle around the speed limit sign in the dash, which I think is useful because it gives me a gentle hint when the car thinks I'm over the speed limit but without any intrusive noise or actual braking.