Cruise Control speeding up to 55 or 75 "automatically" ... aka cruise control trying to kill me or get me arrested

phasornc

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On the freeway, several times I set cruise to around 60 (local freeway is 55mph speed limit). Several times, I've been cruising along for a mile or so, and suddenly, the car speeds up. I look at the cruise setting and it's set to 75mph.

Similar problem when driving on surface roads. After getting off the freeway I have to drive 3-4 miles on 35mph surface roads. Sometimes I set cruise, so I don't accidentally speed up (cops are tough in the town I have to drive through). Nearly every time now, I'm cruising at around 35 for a mile or so and the car speeds up again. I look at the cruise, and it's now set to 55mph.

Has anyone heard of this or experienced it? I can say that I'm not doing anything when the speed changes. In fact the last several times, I've told my wife to watch with me as we set the cruise to 35, I even move my hands so they are nowhere near the control, and it happens over and over again, I see the cruise setting change from 35mph to 55mph when I'm nowhere near any of the controls.
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hybrid2bev

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Go into the Cruise Contol menu and turn off Speed Sign Recognition (aka: Preditive Speed Assist).

It's a well known issue with either the maps having bad data or the camera mis-reading the speed limit signs.
 

azerik

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phasornc

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Thanks. I guess I, like everyone else, thought those settings would "allow" me to set cruise to 20mph over speed limit, not always go 20mph over the speed limit.
 


Ghost Ryder

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It's always interesting to hear how people treat the speed limit in other part of the country. In California, if you're doing 60 in a 55, you're more likely to be pulled over for holding up traffic than for speeding.
 

hprose

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It's always interesting to hear how people treat the speed limit in other part of the country. In California, if you're doing 60 in a 55, you're more likely to be pulled over for holding up traffic than for speeding.
Many many years ago driving a Jag E at 85 on I94W I saw a highway patrolman in the median waving me to go on. Alternatively I got pulled over in Pennsylvania for being in the left lane too long after passing.
 

Mach1E

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Thanks. I guess I, like everyone else, thought those settings would "allow" me to set cruise to 20mph over speed limit, not always go 20mph over the speed limit.
Nope, it makes you go 20 over the limit on cruise.

If you hit the info button next to any setting, it explains what they do. That may help so you don’t have to assume.

I like many don’t like this feature as it changes speed when I didn’t necessarily want to.
 

1Mowavr

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What everyone else said. True. Good for you that found this forum.
I had the same issue when I bought my Mustang. Took it 3 times to 2 different Ford dealerships to complain as is it was very dangerous. They kept the car for a total of 8 days. Only one dealer confirmed the issue by road test but NO dealer had an answer. Each time I finally had to ask for my car back because I needed it.
Found this forum and have been a loyal fan since.
Even sadder, I passed the information to one of the dealers that I had taken it to and they really didn't seem interested in the fix.
 

bbulkow

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It's always interesting to hear how people treat the speed limit in other part of the country. In California, if you're doing 60 in a 55, you're more likely to be pulled over for holding up traffic than for speeding.
With the price of gas being what it is, I see more people on the right doing 60 and 65 in a 65.
 

Shayne

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If it was a percentage variation and not a constant mph it may actually work. 25% would be 69 in a 55 mph but only 44 in a 35 mph. I do not want to be doing the same over in all zones as the cops do not see it that way during quota days. It is off here as it is not useful for my case.
 

ChehRob

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10% over is about what it takes to be polite on most Washington streets and roads.
 

Mach1E

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If it was a percentage variation and not a constant mph it may actually work. 25% would be 69 in a 55 mph but only 44 in a 35 mph. I do not want to be doing the same over in all zones as the cops do not see it that way during quota days. It is off here as it is not useful for my case.
Speeding tickets in the US are based on mph not percentages though.

Not that many use cruise control in a 35 anyways.
 

Shayne

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Speeding tickets in the US are based on mph not percentages though.

Not that many use cruise control in a 35 anyways.
You kind of missed the point. Bet you they are more apt to give you a ticket doing 20 over in a 35 than they are in a 55. Even if they cost you the same. On two way highways you go through small towns here that are 35 mph so yes I would use adaptive if it was a percentage not a constant over. Obviously math would be more practical and work better but understand the resistance.
 

dr__bob

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Go into the Cruise Contol menu and turn off Speed Sign Recognition (aka: Preditive Speed Assist).

It's a well known issue with either the maps having bad data or the camera mis-reading the speed limit signs.
My big realization came when I had cruise control on a country road. Got into a village and the speed limit went to 35. However, some kiddies had graffiti-ed the sign to read 85. Yup, the car sped up very quickly before I could hit the brakes! I turned off sign recognition immediately after that...
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