Pulsing brake lights on new vehicles

[RossABQ]

For many years now (say 10 or more) I have seen what appear to be brand new cars with the high-mounted brake light pulsing, while the main brake lamps do not, at a rate of maybe once per second when the brakes are applied. This pulsing seems to stop after the cars are a month or two old, or maybe it's a mileage thing. I've also seen some (but much fewer) relatively new cars do this, making me wonder if they were just reset, i.e., new PROM or ECU, something like that.

Please tell me I'm not imagining this! and what purpose it serves? Some kind of study? To tell you the truth, I like the idea of pulsing HM lights, but if all cars did it all the time, it would get annoying pretty quickly in heavy traffic.

 

[pontiacjack]

Which is of smaller dimension:
>hare's breath, or
>hair's breadth?
I just want to be sure to use an expression appropriate to its context...

 

[SomptingGuy]

I think an RCH is smaller than both.

- Steve

 

[PEW]

Smallest measurement round these parts is a gnat's c**k.