I don't know the implementation details, but this is common in the county I live in (US). It's been in use for the last 3-5 years. The traffic lights adapt to c

I don't know the implementation details, but this is common in the county I live in (US). It's been in use for the last 3-5 years. The traffic lights adapt to current traffic patterns in most intersections and speed up the green light for roads that have cars.