Join Date: May 2019
Location: Colorado Springs
Tested brake lights with ACC and Regen
As discussed on this forum, I've experienced more tailgaters than in my ICE car. Worried that some drivers might be confused, I decided to test when the brake lights come on with the adaptive cruise control set and during high/low brake regeneration.
With my wife following me I drove a loop three times that included a fairly long and steep decline. First loop, the ACC exactly kept the set speed using Regen during the drive downhill and the brake lights did not come on until near the bottom when ACC needed to use a lot of regen to maintain the set speed.
In low regeneration the brake lights don't come on until the car is under 4 or 5 MPH. In high regen the brake lights come on as soon as the accelerator pedal is released but the lights don't come on when using even slight pressure on the accelerator.
I can see why I've had more tailgaters when driving the I-Pace. Using high regen, the lights come on further from a red light, other stop, or just releasing the accelerator unless I carefully modulate the accelerator. Using low regen brings the car to a stop, albeit at a longer distance than high regen, with no brake lights until the last few MPH. The ACC is so effective at maintaining speed going downhill with no brake lights while the cars following the I-Pace gain speed and ground.
Of course, aggressive, inattentive or distracted drivers are part of the problem but now I know how to drive without adding to another driver's confusion.