If someone hasn't already told you, the reason for the acceleration is that activating the turn signal and moving out from behind the vehicle you are going to pass effectively tells the cruise control that you need to get back to set speed. It is a strange feeling when this happens, but it is either a design feature or design fault. I don't know what would happen if you activated the turn signal and didn't pull out. I don't plan to try it to find out though.

 

I have a new car (not Ford) and while attempting to change lanes, the car did not accelerate until I was clear of the vehicle I was following.
I had learned the timing of when to signal in advance so the speed would increase prior to and during the lane change.
I need to experiment again, but feel confident in saying the Ford design to accelerate in advance is better than waiting for the obstacle to be clear. It may be that a flash to pass vs 'on' may be the difference (can't recall what I did).

I'm in a Toyota and Toyota has gone a bit overboard with their safety controls, therefore I think the Toyota will refuse to give the driver a chance to control the vehicle like the Ford did (2016 Lariat).

 

Sounds like you have one of those radar-based rear collision avoidance systems on that vehicle. A few years ago, had that on a rental '17 or '18 Sienna that really pissed me of as I left the airport in PHX. Had to pull over, read the freakin' manual (which was digital through the infotainment system) so I could figure out how to turn it off.

 

Yes, it is called radar cruise.
It functions the same as the the 2016 adaptive cruse did/does, aside from the ford beginning to accelerate when the turn signal was used.
The Ford had collision avoidance by way of the flashing light and braking (I think it would brake) just as the Toyota does (already got to accidentally test that out).
The Ford would alert me but I don't remember if it would brake so quickly (not with cruise, just normal driving). The Toyota brakes for me (as do the newer F150's than the 2016 I had).

 

My 2019 doesn't begin to accelerate until I've moved into the next lane and the radar/camera combination detects a clear path. In the meantime, I can always press the accelerator myself if I need to speed up to merge.

 

Note 2 explains how ACC reacts to the signal indicator. This is from the 2019 manual and it is how mine works.

 

If you hit and hold the traction control button for about 20 seconds (give or take) it’ll shut off the advance trac. If you double tap the traction control button, it’ll put your truck in advance trac sport mode. Not sure if everyone knew this or not, I found out a couple weeks ago.

 

The double tap is for "fun" mode in the snow or mud.

 

I added the shift console light, now my PRNDM all light up.

Don't know why Ford cut costs on this. Now it isn't so dark in that area anymore.

 

Mine will automatically sense a possible collision situation and the big bright red light flashes on the dash and the collision vehicle icon on the dash and applies the brakes itself. Sometimes, it is very annoying, because it will sense a vehicle from a side street at a stop sign/light and think that the vehicle is a possible collision, because it cant tell if its in motion or not.