The 'level of service' (LOS) for urban roads in India (IRC:106) is classified based on:
Choose the correct answer
Only vehicle type (cars vs trucks)
Volume/Capacity (V/C) ratio for mixed traffic in PCU — LOS A (< 0.35 free flow) to F (> 1.0 breakdown)
Only pedestrian density
Road pavement roughness IRI value only
Correct Answer
B. Volume/Capacity (V/C) ratio for mixed traffic in PCU — LOS A (< 0.35 free flow) to F (> 1.0 breakdown)
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IRC:106 (Guidelines for Capacity of Urban Roads): LOS A–F. India uses Volume/Capacity (V/C) ratio as primary criterion: LOS A (V/C < 0.35): free flow; LOS B (0.35–0.55): stable; LOS C (0.55–0.77): stable; LOS D (0.77–0.90): approaching unstable; LOS E (0.90–1.0): unstable; LOS F (> 1.0): forced/breakdown. Also considers speed and travel time. PCU (Passenger Car Unit) used to convert mixed traffic to equivalent cars.
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