LOS D is commonly understood as:
Choose the correct answer
Completely free flow
No vehicles on road
Limit of stable flow approaching unstable conditions
Forced breakdown flow only
Correct Answer
C. Limit of stable flow approaching unstable conditions
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LOS D represents high-density stable flow with restricted manoeuvrability. Reference: IRC:106-1990 Guidelines for Capacity of Urban Roads in Plain Areas; public PDF page references where text available LOS D definition in PDF/web excerpt
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This MCQ belongs to Geometric Design of Highways and Traffic Engineering. Full tests include timed attempts, rank comparison and subject-wise analysis.