The 'spot speed study' uses a radar gun or pneumatic tube to determine:
Choose the correct answer
Total traffic volume per day only
Speed distribution of individual vehicles — V85 (85th percentile speed) for geometric design and speed limits
Heavy vehicle percentage
Travel time between two cities
Correct Answer
B. Speed distribution of individual vehicles — V85 (85th percentile speed) for geometric design and speed limits
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Spot speed study: measures speed of individual vehicles at a specific point/section. Results: speed distribution (mean μ, SD σ); 85th percentile speed (V85) = design speed for geometric design; 15th percentile = recommended speed for pavement design. Used for: speed limit determination, engineering control decisions, accident analysis. V85 measured under free-flow conditions (no congestion).
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