The 'level of service' (LOS) for a highway describes:
Choose the correct answer
Only the number of lanes
Qualitative measure of traffic conditions (flow, speed, density, V/C ratio) from A (free flow) to F (breakdown)
Pavement structural condition
Road marking quality
Correct Answer
B. Qualitative measure of traffic conditions (flow, speed, density, V/C ratio) from A (free flow) to F (breakdown)
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LOS (HCM, IRC:64): qualitative measure of traffic conditions. LOS A: free flow, low volume, speed near FFS; LOS B: slightly restricted; LOS C: stable flow, noticeable interactions; LOS D: approaching unstable; LOS E: capacity, maximum density; LOS F: breakdown (V/C > 1, queue forms). Governed by: V/C ratio, speed, density. Design target: LOS B or C.
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