Cruise control speed drops unexpectedly

[Deleted member 4669]

Is anyone else having issues with the cruise control feature? I have been trying the intelligent cruise feature and have notice almost all the time i use it a minute or 2 max after I set the speed it will drop to a much lower speed. For example I set it to 50 mph, 45 seconds later the car slows down and it says its set to 22 mph. This type of thing keeps happening. Is this a known issue? I couldnt find any threads. I am not encountering any obstacles or vehicles it literally just slows down.

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[benk016]

There is a certain part of the road going to work from my house, that it drops the speed limit from 65 to 45 for like half a mile and then it goes back to 65. There is no speed limit sign at all in that area so I have no idea where it gets that from.

I think it may still sometimes pull the speed limit from the navigation map data, which can be out of date.

Have you noticed it doing it at the same place every time or is it random?

I also have had it start to slow down like a car is slowing down in front of me, but usually a second or two later it will speed back up, and it doesn't show the cruise speed was changed.

 

[JamieGeek]

The car attempts to read the speed limit signs when "Intelligent Cruise" is enabled.

Are you passing any construction signs?

 

[Deleted member 4669]

There is a certain part of the road going to work from my house, that it drops the speed limit from 65 to 45 for like half a mile and then it goes back to 65. There is no speed limit sign at all in that area so I have no idea where it gets that from.

I think it may still sometimes pull the speed limit from the navigation map data, which can be out of date.

Have you noticed it doing it at the same place every time or is it random?

I also have had it start to slow down like a car is slowing down in front of me, but usually a second or two later it will speed back up, and it doesn't show the cruise speed was changed.

It seems to be random and not related to the speed limit. I also believe I turned off the setting for match or adjust to speed limit, though I could be wrong on that.

 

[Deleted member 4669]

The car attempts to read the speed limit signs when "Intelligent Cruise" is enabled.

Are you passing any construction signs?

No custruction zone. And multiple times it changed the speed to 20-22 in a 45 mph zone.

 

[benk016]

It seems to be random and not related to the speed limit. I also believe I turned off the setting for match or adjust to speed limit, though I could be wrong on that.

You may just have to turn off intelligent cruise. That is the setting that will match speed limits. There is also the slider to allow an overage from the speed limit.

I suspect there is a speed limit on the GPS map data that may be overriding the sign detected by the cameras. (This is just a guess on what is happening since I have a similar issue)

 

[Deleted member 4669]

Ok so it is related to the tolerance setting for intelligent cruise control. For some reason it was set to -13. I definitely did not do that so not sure how that happened but at least I have an explanation.

I will say after playing with it I dont like how it works. Let’s say i am on a one lane road and set it to 40 in a 35. Let’s also say I set the tolerance to +20. As I am driving and say the speed limit changes to 40 mph the car will change to 60 mph. I would expect the tolerance to be the max it will eat you set it to over the speed limit, not the default over the speed limit. Oh well now I know how to get it set up, thanks.

 

[stlippert]

Intelligent Cruise Control is annoying, especially when you are cruising at 70 and hit a constructions zone that says 50. Suddenly the brakes are slammed. I turned the feature off. I will decide when I want to slow down.

 

[usmcsatcom]

I have found that if you have parallel frontage roads, like in Texas, it reads the signs on the other road so I keep doing from 65 to 45 and back again. I had to turn it off.

 

[Deleted member 4669]

So what’s the difference from adaptive and intelligent? Will adaptive still slow down based on traffic? Is speed limit adjustment the only difference? If so I will turn that off.

 

[RedStallion]

The car attempts to read the speed limit signs when "Intelligent Cruise" is enabled.

Are you passing any construction signs?

I don't think it reads the signs. The speed limit comes with the maps. I've seen many times on some portions on the freeway car showed speed limit 55 instead of 65. No signs limiting speed were present. Google maps got it correct, Ford navigation didn't.
I don't use "Intelligent Cruise" for that reason, the speed control is not well implemented.

 

[JamieGeek]

I don't think it reads the signs. The speed limit comes with the maps. I've seen many times on some portions on the freeway car showed speed limit 55 instead of 65. No signs limiting speed were present. Google maps got it correct, Ford navigation didn't.
I don't use "Intelligent Cruise" for that reason, the speed control is not well implemented.

From the owner's manual:

 

[RedStallion]

So what’s the difference from adaptive and intelligent? Will adaptive still slow down based on traffic? Is speed limit adjustment the only difference? If so I will turn that off.

Adaptive CC will keep your speed at or below the limit you set, depending on the speed of a vehicle in front of you. It will not change speed based on maps, but it will still show the speed limit on the display.

 

[RedStallion]

From the owner's manual:

And I know it's not true. Just a few days ago I was driving on the road that had a new 40 mph sign and 20 feet later an old 35 mph sign that still wasn't removed. The car showed 40 mph all the way, the same speed as google maps. Whatever they mean by "speed sign recognition" doesn't mean actually reading speed limit signs.

 

[benk016]

And I know it's not true. Just a few days ago I was driving on the road that had a new 40 mph sign and 20 feet later an old 35 mph sign that still wasn't removed. The car showed 40 mph all the way, the same speed as google maps. Whatever they mean by "speed sign recognition" doesn't mean actually reading speed limit signs.

It absolutely reads signs. But, I think it still also will pull map speed limit data.

I've watched the speed limit change based on a temporary speed limit sign that 100% wouldn't be included in the map data. My Edge before the MME wouldn't do this, It only relied on the map speed limit data.

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