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Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE) PDF Download

Question 1. A parabolic vertical curve is being designed to join a road of grade +5% with a road of grade -3%. The length of die vertical curve is 400 m measured along the horizontal, The vertical point of curvature (VPC) is located an the road of grade +5%. The difference in height between VPC and vertical point of intersection (VPI) (in m, round off to the nearest integer) is _____.    [2019 : 2 Marks, Set-I]
Solution: 
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)

Question 2.  The coefficient of average rolling friction of a road is fr, and its grade is +G%. If the grade of this road is doubled, what will be the percentage change in the braking distance (for the design vehicle to come to a stop) measured along the horizontal (assume all other parameters are kept unchanged)?    [2019 : 1 Mark, Set-I]
(a) Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
(b) Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
(c) Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
(d) Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)

Answer: (c)
Solution:
Percentage change in Braking Distance
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)

Question 3. A car follows a slow moving truck (travelling at a speed of 10 m/s) on a two-lane two-way highway. The car reduces its speed to 10 m/s and follows the truck maintaining a distance of 16 m from the truck. On finding a clear gap in the opposing traffic stream, the car accelerates at an average rate of 4 m/s2, overtakes the truck and returns to its original lane. When it returns to its original lane, the distance between the car and the truck is 16 m. The total distance covered by the car during this period (from the time it leaves its lane and subsequently returns to its lane after overtaking) is    [2018 : 2 Marks, Set-II]
(a) 64 m 
(b) 72 m 
(c) 128 m 
(d) 144 m
Answer: (b)
Solution:
Overtaking time, Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE) 
S = Space heady way = 16 m
a = Acceleration = 4 m/s2 
Distance travelled by vehicle = S2
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)

Question 4. A 7.5 m wide two-lane road on a plain terrain is to be laid along a horizontal curve of radius 510 m. For a design speed of 100 kmph, superelevation is provided as per IRC: 73-1980. Consider acceleration due to gravity as 9.81 m/s2. The level difference between the inner and outer edges of the road (in m, up to three decimal places) is _______ .     [2018 : 2 Marks, Set-II]
Solution: 
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)

Question 5. A priority intersection has a single-lane one-way traffic road crossing an undivided two-lane two- way traffic road. The traffic stream speed on the single-lane load is 20 kmph and the speed on the two-lane road is 50 kmph. The perception- reaction time is 2.5 s, coefficient of longitudinal friction is 0.38 and acceleration due to gravity is 9.81 m/s2. A clear sight triangle has to be ensured at this intersection. The minimum lengths of the sides of the sight triangle along the two-lane road and the single-lane road, respectively will be   [2018 : 2 Marks, Set-I]
(a) 50 m and 20 m
(b) 61m and 18 m
(c) 111m and 15 m
(d) 122 m and 36 m
Answer: 
(c)

Question 6. While aligning a hill road with a ruling gradient of 6%, a horizontal curve of radius 50 m is encountered. The grade compensation (in percentage, up to two decimal places) to be provided for this case would be __________ .    [2017 : 1 Mark, Set-II]
Solution:

Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
∴ Grade compensation = 1.5%

Question 7.  The radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/ hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full lateral friction is assumed to develop), and the value of coefficient of friction needed (if no superelevation is provided) will, respectively, be    [2017 : 2 Marks, Set-I]
(a) Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
(b) Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
(c) Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
(d) Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Answer: 
(c)
Given, R = 120 m, V = 60 kmph and f = 0.15
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE) 

Question 8.  A super-elevation e is provided on a circular horizontal curve such that a vehicle can be stopped on the curve without sliding. Assuming a design speed v and maximum coefficient of side friction fmax, which one of the following criteria should be satisfied?    [2017 : 1 Mark, Set-I]
(a) e ≤ fmax
(b) e > fmax 
(c) no limit on e can be set
(d) Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Answer:
(a)
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Sliding of stopped vehicle occurs if,
mg sinθ > fn
mg sinθ > f(mg cosθ) 

tanθ > f
e> f
Hence, to prevent sliding e ≤ fmax

Question 9. A motorist traveling at 100 km/h on a highway needs to take the next exit, which has a speed limit of 50 km/h. The section of the roadway before the ramp entry has a downgrade of 3% and coefficient of friction (f) is 0.35. In order to enter the ramp at the maximum allowable speed limit, the braking distance (expressed in m) from the exit ramp is_______.    [2016 : 2 Marks, Set-II]
Solution: 
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Total energy lost between point (1) and (2)
= Work done by frictional force
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)

Question 10.  A two lane, one-way road with radius of 50 m is predominantly carrying lorries with wheelbase of 5 m. The speed of lorries is restricted to be between 60 kmph and 80 kmph. The mechanical widening and psychological widening required at 60 kmph are designated as Wme 60 and Wps 60, respectively. The mechanical widening and psychological widening required at 80 kmph are designated as Wme 80 and Wps 80, respectively. The correct values of Wme 60, Wps 60, Wme 80, Wps 80, respectively are    [2016 : 2 Marks, Set-I]
(a) 0.89 m, 0.50 m, 1.19 m, and 0.50 m 
(b) 0.50 m, 0.89 m, 0.50 m, and 1.19 m 
(c) 0.50 m, 1.19 m, 0.50 m, and 0.89 m 
(d) 1.19 m, 0.50 m, 0.89 m, and 0.50 m
Answer: (b)
Solution:
Method-I
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Method-II
As mechanical widening is independent of speed of the vehicle,
Wmc’60= Wme,80 
Hence, options (a) and (b) are eliminated.
Now, as psychological widening is directly proportional to the speed of the vehicle.
Wps,60 < Wps,80 Hence, option (b) is the correct answer.

Question. 11  A superspeedway in New Delhi has among the highest super-elevation rates of any track on the Indian Grand Prix circuit. The track requires drivers to negotiate turns with a radius of 335 m and 33° banking. Given this information, the coefficient of side friction required in order to allow a vehicle to travel at 320 km/h along the curve is    [2015 : 1 Mark, Set-II]
(a) 1.761
(b) 0.176
(c) 0.253
(d) 2.530

Answer: (a)
Solution:
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE)
Note: While deriving the above equation, we consider Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE) but this is not valid in this case because banking provided is very high (tan 33° = 0.65). So formula used should be 

Past Year Questions: Highway Geometric Design & Planning - 1 | Transportation Engineering - Civil Engineering (CE) which will result in f = 0.685.

The document Past Year Questions: Highway Geometric Design & Planning - 1 | 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: Highway Geometric Design & Planning - 1 - Transportation Engineering - Civil Engineering (CE)

1. What is highway geometric design and planning?
Ans. Highway geometric design and planning is the process of determining the layout and dimensions of a highway, including the alignment, cross-section, and other geometric features. It involves considerations such as traffic volume, speed, safety, and convenience of users.
2. What factors are considered in highway geometric design and planning?
Ans. Several factors are considered in highway geometric design and planning, including: - Traffic volume: The amount of traffic expected on the highway affects the design, including the number of lanes and their width. - Speed: The desired speed of travel influences the design, with higher speeds requiring wider lanes and larger curves. - Sight distance: Adequate visibility is crucial for safe driving, so the design must ensure sufficient sight distance for drivers to detect potential hazards. - Terrain: The topography of the area affects the alignment and grade of the highway. - Safety: Design elements such as medians, shoulders, and barriers are incorporated to enhance safety. - Access points: The location and design of access points, such as intersections and ramps, are important considerations. - Environmental impact: The design should minimize the impact on the natural environment, including considerations for drainage, noise, and visual aesthetics.
3. How is the alignment of a highway determined in geometric design and planning?
Ans. The alignment of a highway is determined by considering factors such as topography, land use, and cost. Engineers analyze the terrain and select the most suitable alignment that minimizes earthwork, maximizes safety, and provides the desired travel experience. This may involve curves, tangents, and other geometric elements to ensure a smooth and efficient flow of traffic.
4. What is the role of cross-section in highway geometric design and planning?
Ans. The cross-section of a highway refers to the shape and dimensions of the roadway, including the number of lanes, width, and slopes. It plays a crucial role in determining the capacity, safety, and comfort of the road. The cross-section design considers factors such as traffic volume, speed, and drainage requirements. It also incorporates elements like medians, shoulders, and ditches to accommodate different types of vehicles and provide space for emergency stopping or maneuvering.
5. How does highway geometric design and planning contribute to road safety?
Ans. Highway geometric design and planning play a significant role in enhancing road safety. By considering factors such as sight distance, alignment, and cross-section design, engineers can minimize the risk of accidents and provide a safer driving environment. Adequate sight distance ensures that drivers have enough time to react to potential hazards. Proper alignment and curve design reduce the likelihood of vehicles losing control. The cross-section design includes elements like medians, shoulders, and barriers that provide additional protection and space for emergency maneuvers. Overall, a well-designed highway layout contributes to improved road safety for all users.
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