The 'traffic speed studies' are conducted to determine:
Choose the correct answer
Traffic volume only (PCU/hour)
Speed distribution including 85th percentile speed for design, speed limits, and safety assessment
Road maintenance intervals
Bridge loading only
Correct Answer
B. Speed distribution including 85th percentile speed for design, speed limits, and safety assessment
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Speed studies: determine 85th percentile speed (for design), mean speed (for capacity), 15th percentile (for slow vehicle analysis). Methods: spot speed study (radar gun or tube detector), space mean speed (journey time study, average distance/time). Used to set speed limits, assess safety, design geometric elements.
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