JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech IV Year TRANSPORTATION ENGINEERING Previous Question Paper (October/November - 2020 - R16)
Answer any Five Questions. All Questions Carry Equal Marks.
Main
Explain briefly the modified classification of road system in India as per the Third Road Twenty Year Development Plan, 1981 – 2001.
Answer
The Third Road Development Plan (1981–2001), also known as the Lucknow Plan, introduced a functional classification of the road network in India. This classification system categorizes roads based on their primary function, traffic volume, and the administrative hierarchy of the connectivity they provide. The system classifies the road network into three main categories:
- Primary System: This consists of Expressways and National Highways (NH). Expressways are high-speed, access-controlled roads designed for rapid transit between major hubs, while National Highways serve as the arterial network for interstate movement, connecting state capitals, major ports, and strategic border areas.
- Secondary System: This includes State Highways (SH) and Major District Roads (MDR). State Highways provide connectivity between district headquarters and important towns within a state, linking them to the National Highway network. Major District Roads connect areas of production and markets with either the State Highways or the National Highways.
- Tertiary System: This comprises Other District Roads (ODR) and Village Roads (VR). Other District Roads serve rural areas by connecting villages to the nearest market centers or higher-category roads. Village Roads provide the final link to individual villages, ensuring basic accessibility for rural communities.
The plan emphasized the importance of road density and aimed to achieve a target road density of 82 km per 100 sq. km by the year 2001. It also highlighted the necessity of integrating the road network with other modes of transport to ensure efficient socio-economic development across the country.
Discuss the significant recommendations of Jayakar Committee report? Mention how this helped in road development in India.
Answer
The Jayakar Committee, appointed in 1927, provided foundational recommendations that transformed road development in India:
- Road development should be treated as a national interest, as it had become beyond the capacity of local governments.
- An extra tax on motor spirit (petrol) should be levied to create a dedicated Road Development Fund.
- A semi-official technical body, the Indian Road Congress (IRC), should be established to pool technical knowledge and ensure standard practices.
- A central institution for research and training should be established to promote road engineering standards.
These recommendations led to the creation of the Central Road Fund (CRF) in 1929, the establishment of the IRC in 1934, and the Central Road Research Institute (CRRI) in 1950. This framework provided the financial stability and technical standardization necessary for the systematic planning of the Nagpur, Bombay, and Lucknow road development plans.
Explain with neat sketches the various factors controlling the alignment of roads.
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Derive an expression for finding the stopping sight distance at level and at grades.
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The speeds of overtaking and overtaken vehicle are 80 and 60 kmph respectively. The acceleration of the overtaking vehicle is 2.5 kmph per second, calculate the safe passing sight distance for (i) one-way traffic; (ii) two-way traffic.
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While aligning a highway in a built up area, it was necessary to provide a horizontal circular curve of radius 325m. Design the following geometric features: (a) Super elevation, (b) Extra Widening of pavement, (c) Length of transition curve.
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Explain the relationship between speed and concentration. Derive them and provide plots for them.
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Vehicle ‘A’ is approaching from west and vehicle ‘B’ from south. After collision ‘A’ skids 60° north of east and ‘B’ skid 30° south of east. Skid distance before collision for ‘A’ is 18 m and ‘B’ is 26 m. The skid distances after collision are 30m and 15 m respectively. Weight of ‘A’ and B are 4500 and 6000 respectively. Skid resistance of pavement is 0.55 m. Determine the pre-collision speed.
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From an in-out survey consisting of 50 bays, the initial count was 18. The number of vehicles coming in and out of the parking lot for a time interval of 5 minutes is shown below. Find the accumulation, total parking load, average occupancy, and efficiency of parking lot.
| Time | 5 | 10 | 15 | 20 | 25 | 30 |
|---|---|---|---|---|---|---|
| IN | 7 | 6 | 3 | 3 | 7 | 4 |
| OUT | 2 | 4 | 5 | 2 | 8 | 3 |
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Explain grade separated intersection, the advantageous and limitations.
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Explain the design of flexible pavement using empirical mechanistic method.
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A concrete slab 7.5 m long, 3.5 m wide and 25 cm thick, is subjected to a temperature differential of 10.5 °C. Assuming that k = 50.0 MN/m3 and t = 9 × 10-6 /°C. Determine the maximum curling stress in the interior, edge and corner of the slab. Take the radius of contact as a = 150 mm.
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