Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > On a freeway, spot speed studies are not cond...
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On a freeway, spot speed studies are not conducted if the traffic volumes exceed _____
- a)700-1000 veh/hr/ln
- b)500-600 veh/hr/ln
- c)750-1000 veh/hr/ln
- d)100-200 veh/hr/ln
Correct answer is option 'C'. Can you explain this answer?
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On a freeway, spot speed studies are not conducted if the traffic volu...
Understanding Spot Speed Studies
Spot speed studies are essential for assessing traffic flow and safety on freeways. However, there are specific conditions under which these studies are conducted, particularly concerning traffic volumes.
Traffic Volume Thresholds
- Spot speed studies are generally not conducted when traffic volumes exceed 750-1000 vehicles per hour per lane.
- This threshold is important because high traffic volumes can result in congested conditions, which may skew the results of speed measurements.
Reasons for the Threshold
- Safety Concerns: High traffic volumes can create unsafe conditions for conducting speed studies, as the interactions between vehicles become more complex.
- Data Reliability: At elevated volumes, speeds may be artificially reduced due to congestion, making the data less reliable for assessing the free flow of traffic.
- Operational Conditions: Spot speed studies aim to measure speeds under free-flow conditions. High volumes often lead to stop-and-go traffic, which is not representative of typical freeway operation.
Conclusion
The traffic volume threshold of 750-1000 veh/hr/ln is critical for ensuring that spot speed studies provide accurate and meaningful data. Conducting these studies under lower volume conditions allows for better insights into traffic behavior and aids in effective roadway design and management.
Spot speed studies are essential for assessing traffic flow and safety on freeways. However, there are specific conditions under which these studies are conducted, particularly concerning traffic volumes.
Traffic Volume Thresholds
- Spot speed studies are generally not conducted when traffic volumes exceed 750-1000 vehicles per hour per lane.
- This threshold is important because high traffic volumes can result in congested conditions, which may skew the results of speed measurements.
Reasons for the Threshold
- Safety Concerns: High traffic volumes can create unsafe conditions for conducting speed studies, as the interactions between vehicles become more complex.
- Data Reliability: At elevated volumes, speeds may be artificially reduced due to congestion, making the data less reliable for assessing the free flow of traffic.
- Operational Conditions: Spot speed studies aim to measure speeds under free-flow conditions. High volumes often lead to stop-and-go traffic, which is not representative of typical freeway operation.
Conclusion
The traffic volume threshold of 750-1000 veh/hr/ln is critical for ensuring that spot speed studies provide accurate and meaningful data. Conducting these studies under lower volume conditions allows for better insights into traffic behavior and aids in effective roadway design and management.
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On a freeway, spot speed studies are not conducted if the traffic volu...
On a freeway, spot speed studies are not conducted if the traffic volumes exceed 750-1000 veh/hr/ln. On an uninterrupted flow facility, the spot speed studies are not conducted if the traffic volumes exceed 500 veh/hr/ln.
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On a freeway, spot speed studies are not conducted if the traffic volumes exceed _____a)700-1000 veh/hr/lnb)500-600 veh/hr/lnc)750-1000 veh/hr/lnd)100-200 veh/hr/lnCorrect answer is option 'C'. Can you explain this answer?
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