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Front Brake Lights Could Drastically Diminish Road Accident Rates
(bioengineer.org)
This is a most excellent place for technology news and articles.
it wouldn't indicate for slight turns only standard turns. Normal turns on the road may engage it but It's meant as a "hey this person is actively turning" or as a "this cars wheel is turned that way" so you know the direction it will go if it started moving
but honestly even if it did, it isn't hard to see "oh that car is on a curve obviously it's not turning"