English: Speed-flow diagram or speed-volume diagram: vehicle speed versus vehicles per hour passing through a point on a highway. The horseshoe shape indicates that vehicle throughput collapses when volume is 80%-100% of capacity. The traffic mode changes from free-flowing in the green area, to congested in the gray area. The red area marks rush-hour traffic.
Joe Cortright (April 22, 2020) What Covid-19 teaches us about how to fix freeways[1]
SH1 Northbound at Green Lane – What happens here?[2], Waka Kotahi NZ Transport Agency, 2016
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