[Clay Moore]

I have seen a few people running the multi-flash brake lights in local traffic. It is distracting to have a single vehicle in traffic with these due to the increase in processing that it adds.

I can’t imagine being in a 50 vehicle pile of slow and merging traffic with multi flash brake lights.

[Yo-Yo]

I have seen a few people running the multi-flash brake lights in local traffic. It is distracting to have a single vehicle in traffic with these due to the increase in processing that it adds.

They're seen on some newer cars because some European and/or Asian automotive laws (I'm not entirely sure which countries specifically) require the third brake light to flash briefly when the brakes are first applied. They usually blink 3 or 4 times then light solidly.