Hi guys, those of you with traffic sign recognition, can you tell me if the car slows down and speeds up itself if the ACC is on or does it just highlight the speed on the MFD.

Cheers.

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Hi guys, those of you with traffic sign recognition, can you tell me if the car slows down and speeds up itself if the ACC is on or does it just highlight the speed on the MFD.

The ACC does not adjust to the TSR speed limit. You need to do this manually by flicking the ACC stalk up or down to increase/decrease the ACC speed setting in 5 mph increments or keep the Set button pressed to decrease in 1 mph increments (or 10 km/h and 1 km/h increments if you have the units option set to km/h).

 

You can set an optional alert to sound/display if you exceed the TSR indicated limit and can also set a "tolerance" up to 9 mph above the limit.

As TSR can be easily fooled and doesn't always show the correct speed limit, I found the alerts quickly become irritating and so I don't have the alert enabled.

That's also a reason why it's probably good that the ACC doesn't automatically adjust to the TSR.

The Mark-1 Eyeball is still the best TSR.

Why it's not a good idea to allow ACC to automatically set the limit using TSR...

 

The below map is a route I often use.

The blue arrows show my direction of travel.

The Red numbers with lines are the speed limit signs clearly visible to the TSR camera.

The green numbers are the speed limit that TSR correctly displays.

The purple numbers are the speed limits that TSR incorrectly displays (and in brackets what it should show).

 

 

I have absolutely no idea why it displays 60 mph when I turn right into Billesden Road.

It picks up the 20 mph sign in Billesden Road and displays 20 mph even though I've turned right into Queens Road and remained in a 40 mph limit.

It takes until the third 40 mph repeater sign before it correctly displays the 40 mph limit.

Edited 7 December, 201510 yr by BillyJim

The system where the car shows an internal small display of the speed limits, and other road signs, is a technical leap too far. Encourages the driver to look at a small display in the car, rather than concentrating on the much larger signs by the side of the road and his surroundings.

The system where the car shows an internal small display of the speed limits, and other road signs, is a technical leap too far. Encourages the driver to look at a small display in the car, rather than concentrating on the much larger signs by the side of the road and his surroundings.

Sorry, but I disagree with the sentiment - otherwise we'd best remove the rear view mirror, fuel gauge, speedometer...all of which, like the maxidot, are within your forward peripheral view and anyone who needs more than a split second to take in the information shouldn't be on the road.

The system where the car shows an internal small display of the speed limits, and other road signs, is a technical leap too far. Encourages the driver to look at a small display in the car, rather than concentrating on the much larger signs by the side of the road and his surroundings.

I've lost count of the number of times I've been in a really busy road system turning this way then that way and then trying to remember, or if I've even seen if I've entered a 30, 40, 50 or whatever limit. The system is there as a gentle reminder should you choose to use it, although as Billyjim says it may not get it right every time, its better than not having it in my opinion.

If it's anything like the systems used in other manufacturers' cars it'll primarily work off sat nav data with priority for any road signs it can recognise. I.e. It knows it's on a road with a 50mph limit. It may have missed that sign so will use sat nav data. You drive through a spot of roadworks with a temporary lower limit, it recognises the sign and that will then take precedence. It's also why if there's been a recent change in limit on a road it may get it wrong.

I found it infinitely helpful when driving in Europe to keep track of the speed limits. On our Ford it even got the French motorways right when it was 110 (raining) and 130 (not).

Edited 7 December, 201510 yr by DanJayUK

Sorry, but I disagree with the sentiment - otherwise we'd best remove the rear view mirror, fuel gauge, speedometer...all of which, like the maxidot, are within your forward peripheral view and anyone who needs more than a split second to take in the information shouldn't be on the road.

All 3 of your examples are of information that can only be gained from inside the car. Speed limits and other road signs are available to view without the need to look down inside the car.

I agree that the rear view mirror is within the driver's peripheral vision. The driver can choose when to look at the fuel gauge (very rarely needed to be checked when moving) and also the speedo. But when do you choose to look at the speed limit and/or road sign display? If you have seen the roadside signs, as you should, there is no need to look at the display. If you are in the habit of missing large signs at the side of the road, or on overhead gantries, how do you know when to check the display - every minute (too late), every 5 seconds (not enough attention on the road?

The system is a gimmick. Far too much being added to cars that require the driver to take their attention off the road. Want to adjust air/con or heating? Well its buried in menus on a touch screen (Peugeot).

The system is a gimmick. Far too much being added to cars that require the driver to take their attention off the road. Want to adjust air/con or heating? Well its buried in menus on a touch screen (Peugeot).

 

Bring back contact breakers and square wheels I say!

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I was amazed when travelling up the M42 on Friday that it changed the speed limit in line with the variable speed signs on the gantries, as is said above to be used as a guide, not to be relied upon.

Why it's not a good idea to allow ACC to automatically set the limit using TSR...

The below map is a route I often use.

The blue arrows show my direction of travel.

The Red numbers with lines are the speed limit signs clearly visible to the TSR camera.

The green numbers are the speed limit that TSR correctly displays.

The purple numbers are the speed limits that TSR incorrectly displays (and in brackets what it should show).

I have absolutely no idea why it displays 60 mph when I turn right into Billesden Road.

It picks up the 20 mph sign in Billesden Road and displays 20 mph even though I've turned right into Queens Road and remained in a 40 mph limit.

It takes until the third 40 mph repeater sign before it correctly displays the 40 mph limit.

Would you use ACC in this way though?, I wouldn't have thought it was designed for urban driving. I think it would work well on a motorway though. Picture the scenario, you are travelling on the M25 using the ACC and you are chatting to your passengers and miss the matrix sign advising a lower speed limit, but if the car automatically altered the speed limit when ACC is being used it would save on some unwanted speeding fines.

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I can confirm that it does automatically alter and also at temporary roadworks, seems to work perfectley to me.

I can confirm that it does automatically alter and also at temporary roadworks, seems to work perfectley to me.

So the ACC speed follows the TSR limits?

What are 'TSR limits' ?

I was wondering if a TSR speed limit (that was lower than the currently driven speed) would cause the ACC to drop the speed?

What are 'TSR limits' ?

Traffic Sign Recognition

Would you use ACC in this way though?, I wouldn't have thought it was designed for urban driving. I think it would work well on a motorway though. Picture the scenario, you are travelling on the M25 using the ACC and you are chatting to your passengers and miss the matrix sign advising a lower speed limit, but if the car automatically altered the speed limit when ACC is being used it would save on some unwanted speeding fines.

No, I wouldn't and don't. It was meant as a real-life example that TSR is not infallible and, because it's not infallible, shouldn't be allowed to control the ACC.

 

There are many fairly long stretches of road near me that have 30, 40 and 50 mph limits, some of which I know are enforced and others not, so these are non-motorway situations where (when traffic was light enough to allow it) I previously set the Cruise Control and now the ACC.

As for your scenario, probably not a best example. When I did advanced driving courses the instructors would chastise you for taking your eyes of the road just to look at the person you're talking to. It's human nature to do so, but if you're doing it for that long that you don't see those 'kin big illuminated speed signs...!

As my boss used to say about the M25: "Too many 30 mph brains travelling at 70 mph".

I can confirm that it does automatically alter and also at temporary roadworks, seems to work perfectley to me.

I'm not sure if by "it" you refer to the TSR or the ACC. If your car slowed when it entered temporary roadworks it will have been the ACC matching the slowing vehicle in front.

So the ACC speed follows the TSR limits?

I was wondering if a TSR speed limit (that was lower than the currently driven speed) would cause the ACC to drop the speed?

No, it doesn't do either.

 

Just to clarify - the TSR (Traffic Assist) has no connection to ACC. ACC will continue at the speed you've set regardless of what the TSR shows and a reduction of vehicle speed is only in response to a slower moving vehicle ahead.

I even went for a quick drive just now to make sure I'm getting my facts right...

 

I'm on a long dead-straight derestricted road (60 mph) that eventually leads to a 40 mph limit (with a speed hump).

The Maxidot TSR is correctly showing the 60 mph speed limit sign and as I activate the ACC it sets it at my current speed of 57 mph. I flick the ACC stalk up once and it adjusts the setting to 60 mph.

On approach to the 40 mph limit the TSR is still showing the 60 mph sign and ACC still showing it's set at 60 mph.

I've caught up with a car just before the 40 mph limit starts and the ACC slows me to 47 mph as I enter the 40 limit - the speed being dictated by the ACC matching the car in front.

The TSR display correctly switches to the 40 mph sign as I pass it, the ACC is still showing it's set at 60 mph, and my car is still slowing to below 30 mph because the car in front has slowed for the speed hump.

Over the hump we go and the car in front immediately turns right, leaving the road ahead of me clear.

I'm still in the 40 mph limit. The TSR is still showing the 40 mph speed limit sign, the ACC is still showing it's set at 60 mph - and my car accelerates up to 60mph, 20 mph faster than both the speed limit and what the TSR is showing.

 

I've also gone through the "Car">"Settings" menus on the Columbus.

There is no option for "Travel Assist" (it can only be turned on/off in the Maxidot using the steering wheel's "assist" button).

The only option for ACC is to change the distance it keeps behind a slower moving vehicle (which I have set to "remember last setting" or something similar).

^^^^comprehensive answer, and now absolutely no doubts. Thank you.

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