The 'saturation flow rate' at a signalised intersection is the flow that would cross the stop line:
Choose the correct answer
Flow when signal is red
Maximum flow crossing stop-line if signal remained green indefinitely — theoretical peak capacity of one lane
Total intersection capacity per day
Pedestrian crossing flow rate
Correct Answer
B. Maximum flow crossing stop-line if signal remained green indefinitely — theoretical peak capacity of one lane
Why is this the answer?
Saturation flow s: maximum flow crossing stop-line assuming signal is always green (green throughout = fully saturated condition). s ≈ 1800–2000 PCU/hour/lane for through lane in ideal conditions. Adjusted for: lane width (below 3.6 m: reduces), grade, turning vehicles (PCE = 1.5–2.0 for turns), mix of vehicles. s × effective green g/C = capacity per lane. Webster: degree of saturation x = q/(s×g/C) < 0.9.
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