|
I did some monitoring of this one on my way into work this morning. It appears that the BSM indicator triggers when a car is approximately 1.5 to 2 car lengths off the rear bumper to either side. It turns off when the car is roughly parallel with your vehicle (and thus easily visible to the side).
In all instances where the light was on I was of the opinion that a lane change would probably be considered a fairly aggressive maneuver unless you put your foot into it in order to accelerate ahead of the car behind before making the lane change.
For lane changes at constant speed, I tend to use the rear view mirror as the guide. If I can see the car behind me in the rearview I know that there's ample room to move over.
|