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The traffic starts discharging from an approach at an intersection with the signal turning green. The constant headway considered from the fourth or fifth headway position is referred to as
- a)Saturation headway
- b)Effective headway
- c)Discharge headway
- d)Intersection headway
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
The traffic starts discharging from an approach at an intersection wit...
The answer is option 'A': Saturation headway.
Explanation:
When the traffic signal turns green at an intersection, the vehicles waiting at the approach start discharging and moving forward. The headway is the time interval between two consecutive vehicles passing a specific point on the road. The headway is an important parameter to determine the traffic flow and capacity of an intersection.
Different types of headways:
1. Initial headway: The time interval between the first vehicle and the second vehicle passing a specific point after the signal turns green.
2. Final headway: The time interval between the last vehicle and the second last vehicle passing a specific point after the signal turns green.
3. Average headway: The average time interval between consecutive vehicles passing a specific point after the signal turns green.
4. Saturation headway: The constant headway considered from the fourth or fifth headway position after the signal turns green. It is the headway at which the maximum discharge rate is achieved and the intersection is operating at maximum capacity.
Why is saturation headway important?
- Saturation headway is a critical parameter in traffic engineering as it helps in determining the capacity and performance of an intersection.
- It represents the maximum number of vehicles that can be discharged from an approach per unit time.
- It is used to calculate the saturation flow rate, which is the maximum flow rate of vehicles that can pass through an intersection under ideal conditions.
Other options explained:
- Effective headway: Effective headway is a term used in traffic flow analysis to describe the average time gap between vehicles on the road. It is not specific to the fourth or fifth headway position and does not represent the maximum discharge rate.
- Discharge headway: Discharge headway refers to the time interval between the discharge of two consecutive vehicles at an intersection. It is a general term and does not specifically represent the constant headway considered from the fourth or fifth position.
- Intersection headway: Intersection headway is not a commonly used term in traffic engineering. It is not specific to the constant headway considered from the fourth or fifth position.
Explanation:
When the traffic signal turns green at an intersection, the vehicles waiting at the approach start discharging and moving forward. The headway is the time interval between two consecutive vehicles passing a specific point on the road. The headway is an important parameter to determine the traffic flow and capacity of an intersection.
Different types of headways:
1. Initial headway: The time interval between the first vehicle and the second vehicle passing a specific point after the signal turns green.
2. Final headway: The time interval between the last vehicle and the second last vehicle passing a specific point after the signal turns green.
3. Average headway: The average time interval between consecutive vehicles passing a specific point after the signal turns green.
4. Saturation headway: The constant headway considered from the fourth or fifth headway position after the signal turns green. It is the headway at which the maximum discharge rate is achieved and the intersection is operating at maximum capacity.
Why is saturation headway important?
- Saturation headway is a critical parameter in traffic engineering as it helps in determining the capacity and performance of an intersection.
- It represents the maximum number of vehicles that can be discharged from an approach per unit time.
- It is used to calculate the saturation flow rate, which is the maximum flow rate of vehicles that can pass through an intersection under ideal conditions.
Other options explained:
- Effective headway: Effective headway is a term used in traffic flow analysis to describe the average time gap between vehicles on the road. It is not specific to the fourth or fifth headway position and does not represent the maximum discharge rate.
- Discharge headway: Discharge headway refers to the time interval between the discharge of two consecutive vehicles at an intersection. It is a general term and does not specifically represent the constant headway considered from the fourth or fifth position.
- Intersection headway: Intersection headway is not a commonly used term in traffic engineering. It is not specific to the constant headway considered from the fourth or fifth position.
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The traffic starts discharging from an approach at an intersection with the signal turning green. The constant headway considered from the fourth or fifth headway position is referred to asa)Saturation headwayb)Effective headwayc)Discharge headwayd)Intersection headwayCorrect answer is option 'A'. Can you explain this answer?
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