Adaptive Cruise control speed sign feature

[Hash]

I've got a new to me '22 Lariat. I found the feature where you can turn on speed sign recognition, set the tolerances, and the cruise will adjust the vehicle speed to the settings I have input. Sometimes.... Is there a button I need to push to activate this when turning on the cruise? I haven't been able to get this to work all the time. When I turn the cruise on, it will sometimes set at the speed I'm currently traveling and other times it will adjust the speed to the last sign it read. I can't find anything on how to set it in the onboard manual other than turn on, set +/-, and resume. When that feature is turned on should it just work or do I have to input something else to get it to work? Thanks, hope this makes sense!

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[PNGento]

Shouldn't cross post.

 

[Xman]

Don't use it! It will read signs on the access road and the next thing you know you are decelerating to 45MPH when you are in close traffic doing 70+!

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