"You could design the yellow time so that 90 percent of drivers - or 95 percent -- are not caught in the dilemma zone. But the higher you go, the longer the yellow time is, which increases the time cross traffic is stopped," he says.That would not only increase pollution, Rakha notes, but also the risk of more drivers taking chances to avoid a long light.
Stop, Go, Floor It: The Dilemma Zone
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