Brake Lights or No Brake Lights. That is the question.

Why would you do this? It is much smoother to disengage the cruise, adjust your speed to the desired amount, then re-engage cruise control.

 

That has been discussed before for the older models......and the answer is NO the cruise control will NOT engage the brake lights.

NOW.....on the newer models with "adaptive" cruise and/or things like "collision avoidance" I don't think that subject has come up.

On many you can see the 3rd brake light reflected slightly in the back glass when it's on. Try to look for that.

 

As you noted, putting in very large changes in the cruise setting cause the car to slow very aggressively. Unless this is how you normally drive, doing it manually will be much smoother.

 

On the Prime the cruise control will definitely turn on the brake lights, but usually only when the amount of braking passes where B mode usually is on the display that shows the amount of braking.

 

Before I cancel cruise, I usually push down the go pedal to roughly where it would be if I were driving at the current speed. Then I pull the cruise stalk to cancel. That way the transition is very smooth (I aim for imperceptible) and then I can back off the pedal to slow down.

It was easier in a conventional car where you could feel the pedal was lighter to press right until the point where the cruise servo was holding the cable. In a Prius there is nothing like that to feel, so you have to sort of guess, but it gets better with practice.

 

I’m a bit surprised there isn’t more automation support there, actually. It’s been 10 years since the introduction of ordinary cars with manual transmissions capable of doing automatic rev-matching as you row through the gears, why can’t a cruise control do a smoother handoff?

 

I still have an issue with how this works on the Prime. The brake lights on every car I've ever driven come on with the lightest touch of the brake pedal, not even enough to slow down at all. When the cruise control is braking on the prime, the brake lights don't come on until it's braking moderately hard. That's a different behavior than if the driver is braking, and it potentially gives cars behind you less time to react if they are not expecting to brake.

The Tesla model 3 shows the brake lights on the display. It has one pedal driving, and you have to be slowing down moderately hard before the brake lights come on. Similar to cruise control on the prime, but all the time. It would be interesting to collect statistics on which cars are rear ended most often. The model 3 also has tiny brake lights, I think just eight LEDs each, which can't be optimal for visibility. Although I think certain Camrys are worse with just six LEDs, but I haven't seen one in a while.

 

Don’t post garbage if you haven’t fact checked.

As a moderator here, I think your response is a bit harsh.......and insulting.
Especially when you proceed to do basically the same thing yourself.

 

Car's have had the ability to brake by means other than friction brakes for quite some time. Perhaps longer than they have had brake lights. Then lights may not be working. Or they are two drivers, and the brake lights are always on because of their foot resting on the brake pedal. So drivers should be trained to not rely on the car's lights ahead of them to determine whether they need to slow down or not.

Having the brake lights come on at acertain level of deceleration is probably a good idea, but it is one that should be applied to all car's, not just plug ins.

 

When I do that, I definitely see *a lot* of regen happening. I guess I can’t 100% rule out friction brakes engaging too. My guess would be it’s entirely regen, though.

I don’t immediately know whether the brake lights light, though; good question.