The inconvenient truth about traffic math: Progress is slow
08/28/10 The Wall Street Journal — This month's 60-mile traffic jam in China has demonstrated a frustrating truth about traffic: It is far easier to measure than mitigate. Mathematicians, engineers and planners are making steady advances in assessing traffic congestion and explaining it, but traffic math's strides in reducing congestion are modest, simply because the number of cars often exceeds roadway capacity. If population and the economy keep growing, "there is absolutely no way congestion can stop increasing," says Alex Bayen, an associate professor of systems engineering at UC Berkeley.