The 'critical lane volume' in traffic signal design is defined as:
Choose the correct answer
Total volume on all approaches
Highest lane volume in each phase — governs green time allocation; sum across phases (Y) determines cycle length
Only pedestrian crossing volume
Volume at the end of the green phase
Correct Answer
B. Highest lane volume in each phase — governs green time allocation; sum across phases (Y) determines cycle length
Why is this the answer?
Critical lane volume: maximum lane volume among all lanes moving during one phase. For each phase: critical volume = volume of lane that controls green time (highest demand). Sum of critical volumes (y = v/s, v=volume, s=saturation flow) across phases (Y = Σy) determines cycle length and is measure of intersection loading. Oversaturation when Y > 0.9.
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