Cruise control / Collision avoidance failure

[A3r03ng]

When using any cruise control, keeping your foot over the brake pedal when necessary, or the accelerator (when causing on the open highway in case it recognizes a speed decrease), is how you should be using it.

? Sounds like driving without cruise control. Or rather, even less predictable and more dangerous than without cruise control...

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[A3r03ng]

Yes at times going under 50mph. Our GTPE did not slow down as the car ahead put on their brakes. I always us the adaptive cruise for safety concerns now at 75 yr I assumed it is faster then me or is It?

I know... Just take care !

 

[RickMachE]

? Sounds like driving without cruise control. Or rather, even less predictable and more dangerous than without cruise control...

If you're using any type of cruise control without being prepared to assume control, you're not driving safely. Having my foot OFF the pedal but near the pedal, ready to react, is not "driving without cruise control", nor "less predictable and more dangerous".

 

[Vgkfan]

I don't buy the explanations either.
Good point. Same here in Europe (Belgium), except that if the cars stops for less than 30 seconds (or one minute, or less, not sure) it can move forward again without having to push the button. If it stops for a longer time, then it will not restart unless you push the button. I (used to) find this very convenient for a fast moving traffic, with very short stops.

After coming to a complete stop using cruise control, I just push the accelerator to get moving and the cruise control picks up where it left off. Seems to work better for me than the resume button.

 

[Mach1E]

Yes at times going under 50mph. Our GTPE did not slow down as the car ahead put on their brakes. I always us the adaptive cruise for safety concerns now at 75 yr I assumed it is faster then me or is It?

Not really.

It (and Bluecruise) are meant to be drivers aids, not drivers.

There was a BC video a while back that explained this well.

Summary: don’t treat cruise control or BC like a science experiment. Don’t wait to see if the computer will react when you KNOW you should brake. You can see the cars 5 cars up with brake lights slowing down, the car can’t.

Once you treat it like a “helper” rather than let it make the decisions and you are the “backup driver,” you will be way better off.

 

[Rt1AWD]

Another thing I've noticed. When there are a bunch of cars standing in traffic and the car infront of your suddenly decides to change the lane it would be a good idea to take control at this moment as your mustang may not detect the next car in front.

 

[Motomax]

I don’t usually use it in traffic but I haven’t had any issues. Although, it doesn’t like following teslas. I guess when you have two cars that brake last minute it doesn’t leave you much comfort room.

 

[GuliblGuy]

Was the car a decent ways in front of you in the roundabout?

When I first got the car I was testing adaptive cruise/lane keeping (not blue cruise) on some twisty roads with my hands/feet hovering above the controls just to see what it would do. When the car in front of me went through the turn and I had not yet started to go through it, as far as my car could "see" in front of it, there was no one there, so it would hit the accelerator and get up to the pre set speed, but then once I got into the turn and the car was back in front of me it picked it up and hit the brakes.

 

[Awmustang]

https://arstechnica.com/cars/2018/06/why-emergency-braking-systems-sometimes-hit-parked-cars-and-lane-dividers/#:~:text=A car's radar will detect,overhead signs, and so forth.

https://www.nissan-global.com/EN/INNOVATION/TECHNOLOGY/ARCHIVE/MOD/you may want to do some research on how the systems work. Can not detect stationary objects.

What went wrong was potentially a failure to understand how these systems work and their limitations.

If it can't detect stationary objects how come it comes to a stop behind a stationary object just fine? Done it a bunch of times in my Edge.

 

[i8iridium]

If it can't detect stationary objects how come it comes to a stop behind a stationary object just fine? Done it a bunch of times in my Edge.

There's a point where the the car use the camera more than the radar, and then the radar more than the camera. I don't know the distances there's a switch off, but with low speed stop-and-go, it's a different algorithm than highway speed blue cruise. The camera is just like your eyes, maybe worse because it's only 2D, it can't tell at a long distance that the cars are stopped. That's where the radar comes in, but that's still a short distance. That's the point you should be paying attention and taking over.

 

[Blue highway]

If it can't detect stationary objects how come it comes to a stop behind a stationary object just fine? Done it a bunch of times in my Edge.

The system Ford uses employs both cameras and Radar. There are cases where both struggle.

If and object is stopped, Radar is a problem. If it is dark, raining, looking directly into the sun, dirty glass, etc. the camera has a problem.

My purpose in pointing these things out, is that people that have no idea how the systems actually work have strong opinions that they should always work. They don't. It's fairly easy to come across edge cases where they don't do what users expect.

e.g. cars from lots of brands plow into parked cars, or videos in the forum of the MME running over inflatables... clearly the camera can see them... why does this happen? The Ford system is rather good, but all systems have limitations and in my view a lot (most?) users have a magical view that these systems never fail and are not ready to hit the brakes.

 

[Jimmyd]

Not sure that I buy this explanation.

Car is designed and built to be able to use cruise control, even to a complete stop. It should (and is) able to detect stationary objects.

Something clearly went wrong.

That said, when I used adaptive cruise and the car comes to a complete stop, I have a prompt on the screen and have to hit a button to “resume,” the car won’t accelerate from zero without input from me. Are European models different?

Must be. I have to push the accelerator.

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