You can't imagine in the 31 years that I designed, installed and maintained traffic signal control systems the number of so-called engineers thought their degree made them an expert and that they knew more about everything.
I can attest that it's a long way from "seeing it done" and "reading about it" to "actually fixing it and making it work like it should"....and that includes the timing of the traffic signals. One has to consider many variables: road width, lane width, number of lanes, road grade, pavement composition, curves, visibility, 85th percentile speed, posted speed limit, intersection width, egress/ingress of private businesses, driveways, location and size of inductive vehicle detection loops in the pavement and more.
There's no one size fits all and I doubt the "engineer" that reported it had a clue what he was talking about except maybe in his own mind.
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