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A series of decisions were made at Mini which resulted in what is unambiguously the worst indicator design of all time. It is so bad that after seeing it on the street, I just had to post about it here.
This paper contains data relating to the effectiveness of amber turn signals by comparing striking and struck cars with the same configuration (amber or red), and the odds of not getting struck with an amber turn signal equipped vehicle is always about 4-8% better than otherwise.
Amber has been scientifically proven to be easier to notice, and mildly safer than using the same bulb as the brake light to indicate a turn.
Here’s a paper on it. https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/811115
This paper contains data relating to the effectiveness of amber turn signals by comparing striking and struck cars with the same configuration (amber or red), and the odds of not getting struck with an amber turn signal equipped vehicle is always about 4-8% better than otherwise.