The reason I mentioned the third brake light is that it is not actually "stated" as being against any regultion to have it flash. Maybe because it is not a"required" brake light. (In fact, it was tested on public roads in the Republic of Kalifornia so it must not be too outrageous.)

The website you mentioned is similar to another one I found that has the electronic module for controlling a 4 flash then steady set up. I also found a DIY schematic for home building a circuit that does this.

When I mentioned strobe, the idea that came to mind was the addition of a small strobe inside the brake light. This would be similar to the modulated headlight idea with the light on and a higher intensity strobe.

Now all I need to do is find a third brake light that looks OE.

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Sam

84 300SD 350K+ miles ( Blue Belle )