This is certainly an interesting proposal: change the length of the yellow light so that when you approach the intersection, the light length is adjusted to be what you can safely clear the intersection in, depending on age, speed, and previous attempts to clear the light. And yes that does mean collecting data on driver's behaviour… without them necessarily noticing. The goal, reducing road accidents, would be nice, though – helping drivers better judge if they can clear the intersection in time before the light turns red. On the other hand, it may lead to interesting behaviours as drivers get used to 'their' light length – perhaps disconcerting having to mentally adjust between light length schemes in a single deployment scenario, and changing their behaviour in a mass deployment scenario.
Length of yellow caution traffic lights could prevent accidents: study
A couple of years ago, Hesham Rakha misjudged a yellow traffic light and entered an intersection just as the light turned red. A police officer handed him a ticket.
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