Capacity of Sags and Tunnels on Japanese Motorways

Abstract

Since the early 1980s, some of the tunnels and vertical alignment sags cm Japanese motorways have been recognized as capacity bottlenecks. Congestion queues have been frequently observed on holidays at these bottlenecks, and the capacity values have been found to range from 2,200 vehicles per hour (vph) to 2,700” vph per two lanes in the same direction… (More)

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