traffic engineering surveys speed flow density intersections signals road safety - One Line Questions

1. The relationship between speed, flow, and density is often represented by the fundamental equation: Flow = Speed × Density. If flow is 2000 vehicles/hour and density is 50 vehicles/km, what is the average speed? — 40 km/hr
2. What does the Highway Capacity Manual (HCM) provide? — Methodologies for analyzing the capacity and level of service of various highway facilities
3. What is the 'protected-permissive' phase in traffic signal terminology? — A phase where a left-turn movement has a protected green arrow followed by a permissive green ball
4. Which type of traffic signal control is typically used at low-volume intersections with predictable traffic patterns? — Pre-timed signals
5. The 'level of service' (LOS) concept in traffic engineering is used to: — Describe operational conditions and quality of traffic flow
6. Which of the following is a primary cause of traffic congestion? — Bottlenecks and insufficient capacity
7. The 'jam density' is the density at which: — Speed is zero and density is maximum
8. The relationship where flow decreases as density increases beyond a certain point is characteristic of: — Congested traffic conditions
9. Road safety audits are primarily conducted to: — Identify potential hazards and recommend safety improvements
10. A 'speed-density relationship' typically shows that as density increases, speed: — Decreases
11. Which of the following is a proactive approach to road safety? — Implementing traffic calming measures
12. Which of the following is a common method for measuring spot speed? — Radar gun or pneumatic tubes
13. A traffic study involving placing observers at specific points to record vehicle characteristics and driver actions is known as a: — Enoscope study
14. Which tool is commonly used for detailed analysis of traffic operations at complex intersections? — Traffic simulation software (e.g., VISSIM, CORSIM)
15. Which survey method is most suitable for determining the origin and destination of traffic? — Home interview surveys
16. Which factor is NOT typically considered when determining the capacity of a highway segment? — Average trip length
17. Which type of traffic signal controller adjusts signal timing based on detected vehicle presence? — Actuated controller
18. Which type of traffic signal control is most responsive to real-time traffic demand? — Actuated signals
19. What is a 'saturation flow rate' at an intersection approach? — The maximum flow rate achievable under ideal conditions with a continuous demand
20. What is the 'space mean speed'? — The arithmetic mean of the speeds of vehicles at a given instant over a given length of roadway
21. What does the 'headway' refer to in traffic flow? — The time interval between the front of two consecutive vehicles passing a point
22. In traffic signal timing, what is 'cycle length'? — The total time for all phases to occur once
23. In the context of traffic signals, what is 'phase'? — A specific movement or group of compatible movements given the right-of-way
24. What is the 'clearance interval' in a traffic signal cycle? — The all-red phase, providing time for vehicles to clear the intersection
25. What is the critical lane in the context of intersection analysis? — The lane that controls the capacity of the intersection approach
26. The 'capacity of an intersection' is defined as: — The maximum number of vehicles that can pass through the intersection in an hour
27. A 'travel time study' is used to determine: — The time taken to travel between two points
28. What does a 'traffic stream model' aim to describe? — The macroscopic behavior of traffic flow, speed, and density
29. What does a 'peak hour factor' (PHF) represent? — The ratio of average flow rate to the maximum flow rate in 15-minute intervals within the peak hour
30. What is the 'minimum headway'? — The shortest time interval between two consecutive vehicles passing a point
31. What is the 'lost time' in traffic signal phasing? — The time taken to accelerate from a stop and decelerate to a stop
32. What does 'traffic density' represent in traffic engineering? — The number of vehicles occupying a given length of roadway at a specific instant
33. What is the main advantage of using automatic traffic recorders (ATRs) over manual counts? — They can operate continuously and unattended for long periods
34. Which of the following is the primary objective of a traffic volume study? — To count the number of vehicles passing a point over a period of time
35. What is the primary function of a 'traffic simulation model'? — To replicate traffic operations and test different scenarios
36. What is the primary purpose of 'traffic rationing' or 'demand management' strategies? — To reduce traffic demand during peak periods
37. What is the main goal of implementing traffic calming measures? — To improve road safety by reducing speed and volume
38. What is the primary purpose of a 'turning movement count' at an intersection? — To count vehicles making left, right, and through movements
39. What is the purpose of a speed and delay study? — To identify bottlenecks and causes of delay
40. What is the purpose of a 'cordon line' in traffic surveys? — To count traffic entering or leaving a defined area
41. What is the primary purpose of a roadside interview survey? — To collect information on trip purpose, mode of travel, and O-D data
42. The maximum flow rate that can be achieved at a specific location under prevailing conditions is known as: — Traffic capacity
43. Which type of survey is most effective for understanding driver behavior and attitudes towards safety? — Attitude surveys or driver questionnaires
44. Which survey method is best for determining the economic impact of a new road? — Economic impact study (often involving surveys of businesses and residents)
45. Which type of survey is most useful for understanding the modal split of commuters? — Home interview survey or travel diary
46. Which survey is crucial for planning public transportation routes and services? — Origin-destination study
47. The 'capacity reduction factor' is used in intersection analysis to account for: — The effect of heavy vehicles and grades
48. Which of the following is NOT a direct measure of traffic flow? — Vehicles per kilometer
49. Which of the following is a qualitative measure of traffic flow? — Level of Service (LOS)
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