Operation Question

[hksoundpro]

I'd have to give the nod to WaltBurkett's point.
There's no limit to what can be implemented,from a technical
standpoint, with some understanding of the basics of cars and
their electrical systems.
I frequently have to rein in customer's enthusiasm in this regard,
as they often fail to consider Murphy's Law.
The only add-on I've ever put to use (on brake lights) is a
manually operated, momentary circuit to allow me to flash the brake lights
at that AS**OLE who's following 3 feet off my bumper, through a tunnel.
He backs off when you flash, and you don't have to be worried that he'll
bash into your rear-end.
To be used prudently, of course.

[Talljoe]

I'd have to give the nod to WaltBurkett's point.
There's no limit to what can be implemented,from a technical
standpoint, with some understanding of the basics of cars and
their electrical systems.
I frequently have to rein in customer's enthusiasm in this regard,
as they often fail to consider Murphy's Law.
The only add-on I've ever put to use (on brake lights) is a
manually operated, momentary circuit to allow me to flash the brake lights
at that AS**OLE who's following 3 feet off my bumper, through a tunnel.
He backs off when you flash, and you don't have to be worried that he'll
bash into your rear-end.
To be used prudently, of course.

That's the only use I ever found for the rear fog light on my Volvo, since most people here don't know what to do with it.

[fulcrum]

I am doing what Cliff suggested, but use a separate LI CPU unit for the rear. The LI disables my breaking light automatically for a few seconds during"from behind" alerts.
The 2nd CPU unit is also mounted in the back of the car, so the alarm also sounds from behind. Almost automatically/naturally you realize the threat isbehind you.
Just don't hit the brakes like a blind cow, first look, then slow down and kill the LI at the PSL.