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Which of the following statements CANNOT be used to describe free-flow speed (uf) of a traffic stream?
- a)uf is the speed when the flow is negligible.
- b)uf is the speed when density is negligible.
- c)uf is affected by geometry and surface conditions of the road.
- d)uf is the speed at which flow is maximum and density is optimum.
Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements CANNOT be used to describe free-flow...
Free flow speed (Vf) is that speed at which flow and density is negligible
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Which of the following statements CANNOT be used to describe free-flow...
Explanation:
Free-flow speed (uf) is a fundamental parameter used in traffic engineering and transportation planning. It is defined as the speed at which vehicles would travel if there were no other vehicles on the road. Here are the statements that describe free-flow speed and why option D is incorrect:
Statement A - uf is the speed when the flow is negligible: This statement is correct because free-flow speed is the speed at which vehicles can travel without any interference from other vehicles. When the flow of vehicles is negligible, the free-flow speed is the same as the speed limit on the road.
Statement B - uf is the speed when density is negligible: This statement is also correct because free-flow speed is inversely proportional to traffic density. When the density of vehicles is very low, the free-flow speed is the maximum possible speed on the road.
Statement C - uf is affected by geometry and surface conditions of the road: This statement is correct because the geometry and surface conditions of the road determine the maximum safe speed that vehicles can travel. For example, a road with many curves, steep grades, or poor pavement conditions will have a lower free-flow speed than a straight, flat road with good pavement.
Statement D - uf is the speed at which flow is maximum and density is optimum: This statement is incorrect because the free-flow speed is the speed at which there is no interference from other vehicles. It does not depend on the flow or density of vehicles on the road. The maximum flow and optimum density occur at a different speed, which is known as the critical speed. The critical speed is the speed at which the maximum number of vehicles can pass through a given section of road without causing congestion.
In conclusion, option D is the statement that cannot be used to describe free-flow speed.
Free-flow speed (uf) is a fundamental parameter used in traffic engineering and transportation planning. It is defined as the speed at which vehicles would travel if there were no other vehicles on the road. Here are the statements that describe free-flow speed and why option D is incorrect:
Statement A - uf is the speed when the flow is negligible: This statement is correct because free-flow speed is the speed at which vehicles can travel without any interference from other vehicles. When the flow of vehicles is negligible, the free-flow speed is the same as the speed limit on the road.
Statement B - uf is the speed when density is negligible: This statement is also correct because free-flow speed is inversely proportional to traffic density. When the density of vehicles is very low, the free-flow speed is the maximum possible speed on the road.
Statement C - uf is affected by geometry and surface conditions of the road: This statement is correct because the geometry and surface conditions of the road determine the maximum safe speed that vehicles can travel. For example, a road with many curves, steep grades, or poor pavement conditions will have a lower free-flow speed than a straight, flat road with good pavement.
Statement D - uf is the speed at which flow is maximum and density is optimum: This statement is incorrect because the free-flow speed is the speed at which there is no interference from other vehicles. It does not depend on the flow or density of vehicles on the road. The maximum flow and optimum density occur at a different speed, which is known as the critical speed. The critical speed is the speed at which the maximum number of vehicles can pass through a given section of road without causing congestion.
In conclusion, option D is the statement that cannot be used to describe free-flow speed.
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Which of the following statements CANNOT be used to describe free-flow speed (uf) of a traffic stream?a)ufis the speed when the flow is negligible.b)ufis the speed when density is negligible.c)ufis affected by geometry and surface conditions of the road.d)uf is the speed at which flow is maximum and density is optimum.Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements CANNOT be used to describe free-flow speed (uf) of a traffic stream?a)ufis the speed when the flow is negligible.b)ufis the speed when density is negligible.c)ufis affected by geometry and surface conditions of the road.d)uf is the speed at which flow is maximum and density is optimum.Correct answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Which of the following statements CANNOT be used to describe free-flow speed (uf) of a traffic stream?a)ufis the speed when the flow is negligible.b)ufis the speed when density is negligible.c)ufis affected by geometry and surface conditions of the road.d)uf is the speed at which flow is maximum and density is optimum.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements CANNOT be used to describe free-flow speed (uf) of a traffic stream?a)ufis the speed when the flow is negligible.b)ufis the speed when density is negligible.c)ufis affected by geometry and surface conditions of the road.d)uf is the speed at which flow is maximum and density is optimum.Correct answer is option 'D'. Can you explain this answer?.
Which of the following statements CANNOT be used to describe free-flow speed (uf) of a traffic stream?a)ufis the speed when the flow is negligible.b)ufis the speed when density is negligible.c)ufis affected by geometry and surface conditions of the road.d)uf is the speed at which flow is maximum and density is optimum.Correct answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Which of the following statements CANNOT be used to describe free-flow speed (uf) of a traffic stream?a)ufis the speed when the flow is negligible.b)ufis the speed when density is negligible.c)ufis affected by geometry and surface conditions of the road.d)uf is the speed at which flow is maximum and density is optimum.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements CANNOT be used to describe free-flow speed (uf) of a traffic stream?a)ufis the speed when the flow is negligible.b)ufis the speed when density is negligible.c)ufis affected by geometry and surface conditions of the road.d)uf is the speed at which flow is maximum and density is optimum.Correct answer is option 'D'. Can you explain this answer?.
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