Past Year Questions: Traffic Engineering - 2

Past Year Questions: Traffic Engineering - 2 | Transportation Engineering - Civil Engineering (CE) PDF Download

Question 1. An observer counts 240 veh/h at a specific highway location. Assume that the vehicle arrival at the location is Poisson distributed, the probability of having one vehicle arriving over a 30-second time interval is _______ .     [2014 : 2 Marks, Set-II]
Solution:

Question 2. The average spacing between vehicles in a traffic stream is 50 m, then the density (in veh/km) of the stream is __________ .      [2014 : 1 Mark, Set-II]
Solution:

Question 3.  An isolated three-phase traffic signal is designed by Webster's method. The critical flow ratios for three phases are 0.20,0.30, and 0.25 respectively and lost time per phase is 4 seconds. The optimum cycle length (in seconds) is ___________ .      [2014 : 2 Marks, Set-I]
Solution: Sum of the flow,
y = y1 + y2 + y3
= 0.2 + 0.3 + 0.25 = 0.75
Total lost time in a cycle L = 4 x 3 = 12 sec.
Optimum cycle length,

Question 4.  The speed-density (u-k) relationship on a single lane road with unidirectional flow is u = 70-0.7 k, where u is in km/hr and k is in veh/km. The capacity of the road (in veh/hr) i s ___________ .     [2014 : 2 Marks, Set-I]
Solution:
Method-I

Method-II

Question 5.  The minimum value of 15 minute peak hour factor on a section of a road is     [2014 : 1 Mark, Set-I]
(a) 0.10
(b) 0.20
(c) 0.25
(d) 0.33
Solution:
Method-I
15 min. peak hr factor is used for traffic intersection design,

V15 = Maximum 15 minute volume within the peak hr. (veh.)
Maximum value is 1.0 and minimum value is 0.25 Normal range is 0.7 - 0.98
Method-I
Consider a peak hour with total traffic V.
Let the traffic be divided as such,

Question 6. For two major-roads with divided carriage way crossing at right angle, a full clover leaf interchange with four indirect ramps is provided. Following statements are made on turning movement of vehicles to all direction from both road, identity the correct statement.   [2013 : 1 Mark]
(a) Merging from left is not possible, but diverging to left not possible.
(b) Merging from left and diverging to left is possible.
(c) Merging from left is possible but diverging is not possible.
(d) Neither merging from left nor diverging to left is possible.

Solution:Merging from left is done using a clover left and diverging to left is done using indirect ramp.

Question 7. It was observed that 150 vehicle crossed a particular location of highway in 30 minutes. Assume that vehicle arrival follow a negative exponential distribution. The number of time headways greater than 5 sec. in above observation is    [2013 : 1 Mark]
Solution:

Where, P(x) is the probability of x events (vehicle arrivals) in some time interval (t).
X is the mean arrival rate in that interval.

Now, the probability that zero vehicle arrive in an interval t, denoted as P(0), will be same as the probability that the headway (into arrival time) greater than or equal to t.

Question 8. A two-lane urban road with one-way traffic has a maximum capacity of 1800 vehicles/hour. Under the jam condition, the average length occupied by the vehicles is 5.0 m. The speed versus density relationship is linear. For a traffic volume of 1000 vehicles/hour, the density (in vehicles/km) is    [2012 : 2 Marks]
(a) 52
(b) 58
(c) 67
(d) 75
(c)
Solution:
Method-II

Capacity per lane

∴ k = 33.32 Veh./km (for single lane)
So, for two lane urban road,
k = 33.32 x 2 = 66.64 ∼ 67
Method-II

Question 9. Two major roads with two lanes each are crossing in an urban areas to form an un-controlied intersection. The number of conflict points when both roads are one way is “X' and when both roads are two-way is “ Y'. The ratio of  X to Y is     [2012 : 1 Mark]
(a) 0.25
(b) 0.33
(c) 0.50
(d) 0.75
(a)
Solution:
When both roads are one-way then total no. of conflict points, x = 6
When both roads are two-way then total no . of conflict points, y = 24

Question 10.  The cumulative arrival and departure curve of one cycle of an approach lane of a signalized intersection is shown in the adjoining figure. The cycle time is 50 s and the effective red time is 30s and the effective green time is 20 s. What is the average delay?   [2011 : 2 Marks]

(a) 15 s
(b) 25 s
(c) 35 s
(d) 45 s
(a)
Solution:
Method-I

Average delay

Method-II

Vehicle 1 arrives at 0 second and departs at 30 seconds.
Vehicle 40 arrivers at 50 seconds and departs at the same time.
Delay for vehicle 1 = 30 second
Delay for vehicle 40 = 0 second

Question 11. If the jam density is given as k- and the free flow speed is given as uf, the maximum flow for a linear traffic speed-density model is given by which of the following options?    [2011 : 2 Marks]
(a)
(b)

(c)
(d)
(a)

Question 12. The probability that k number of vehicles arrive (i.e. cross a predefined line) in time t is given as (λt) e-λt/k! where λ is the average vehicle arrival rate. What is the probability that the time headway is greater than or equal to time t1?   [2011 : 1 Mark]
(a)
(b)
(c)
(d)
(d)
Solution: Probability of arriving 'n' number of vehicles in time f,

If time headway is greater than or equal to time f, then number of vehicles arriving is zero,

Question 13. As per IRC: 67-2001, a traffic sign indicating the Speed Limit on a road should be of   [2010 : 1 Mark]
(a) circular shape with white background and red border
(b) triangular shape with white background and red border
(c) triangular shape with red background and white border
(d) circular shape with red background and white border

Solution: Speed limit sign is a regulatory or mandatory sign and should be of circular shape with white background and red border.

The document Past Year Questions: Traffic Engineering - 2 | Transportation Engineering - Civil Engineering (CE) is a part of the Civil Engineering (CE) Course Transportation Engineering.
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FAQs on Past Year Questions: Traffic Engineering - 2 - Transportation Engineering - Civil Engineering (CE)

 1. What is traffic engineering and why is it important?
Ans. Traffic engineering is a branch of civil engineering that deals with the design, analysis, and management of transportation systems to ensure the safe and efficient movement of vehicles, pedestrians, and goods. It involves optimizing traffic flow, improving safety, reducing congestion, and enhancing overall transportation system performance. Traffic engineering is important as it helps minimize travel time, fuel consumption, and environmental impacts, while also ensuring road safety and providing a smooth and reliable transportation experience for users.
 2. What are the key factors considered in traffic engineering?
Ans. Traffic engineering takes into account various factors to plan and manage transportation systems effectively. Some key factors include: - Traffic volume and composition: The number and types of vehicles on the road. - Traffic flow characteristics: How vehicles move, including speed, acceleration, and deceleration patterns. - Road geometry: The physical aspects of the road, such as lane width, curvature, and grade. - Traffic control devices: The use of signals, signs, and markings to regulate traffic. - Intersection design: The layout and operation of intersections to facilitate safe and efficient movements. - Traffic safety: Measures to reduce accidents and injuries, such as speed limits, traffic calming techniques, and safety barriers. - Intelligent transportation systems: The integration of technology and communication systems to improve traffic management and provide real-time information to users.
 3. How is traffic congestion managed in traffic engineering?
Ans. Traffic congestion is a major challenge in urban areas, and traffic engineering employs various strategies to manage it. Some common approaches are: - Traffic signal optimization: Adjusting signal timings based on traffic patterns to reduce delays and improve traffic flow at intersections. - Road capacity improvements: Expanding road infrastructure, adding lanes, or creating bypasses to accommodate increased traffic demand. - Public transportation enhancements: Encouraging the use of public transport by improving its accessibility, reliability, and frequency. - Demand management: Implementing measures such as carpooling, ride-sharing, and congestion pricing to reduce the number of vehicles on the road. - Intelligent transportation systems: Utilizing technology to monitor traffic conditions, provide real-time information to drivers, and facilitate adaptive traffic control. - Transportation demand management: Promoting alternative travel modes like walking, cycling, and telecommuting to reduce the reliance on private vehicles.
 4. How does traffic engineering contribute to road safety?
Ans. Traffic engineering plays a crucial role in ensuring road safety. It involves: - Designing roads and intersections with appropriate geometric features, such as adequate sight distance, proper lane widths, and clear signage, to enhance visibility and minimize potential conflicts. - Analyzing crash data and identifying high-risk locations to implement targeted safety improvements, such as installing traffic signals, roundabouts, or pedestrian crossings. - Implementing traffic calming measures, such as speed humps, raised crosswalks, and chicanes, to reduce vehicle speeds and enhance pedestrian safety. - Conducting traffic impact assessments to evaluate the safety implications of proposed development projects and recommending mitigation measures. - Educating the public about safe driving behaviors, traffic rules, and the importance of adhering to speed limits and traffic signals.
 5. How does traffic engineering contribute to sustainable transportation?
Ans. Traffic engineering aims to promote sustainable transportation by: - Encouraging the use of public transportation, walking, and cycling through the provision of safe and convenient infrastructure, such as sidewalks, bike lanes, and transit stops. - Designing transportation systems that prioritize the movement of people rather than just vehicles, emphasizing efficient and multimodal transportation options. - Implementing intelligent transportation systems and traffic management strategies to optimize traffic flow, reduce congestion, and minimize fuel consumption and emissions. - Incorporating green infrastructure, such as vegetated medians and permeable pavements, to manage stormwater runoff and improve environmental sustainability. - Integrating land use and transportation planning to create compact, mixed-use developments that reduce the need for long-distance travel and promote walkability.

Transportation Engineering

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