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Highway Engineering (141-160)

Updated: Apr 26, 2020

141.A hill road is one which passes through a terrain with a cross slope of 25 to 60%


142. Fig. shows a longitudinal section AB of a hill road. The resisting length L is

given by

where f is the coefficient of frictional resistance

Lᵣ = L₁ +h/f


143. In hill roads if several alternate alignments are surveyed which fulfill the geometric standards, then the preferred alignment is the one which has resisting length as minimum


144. The camber for hill roads in case of bituminous surfacing is adopted as 2.5%


145. The superelevation to be provided in horizontal curves of radius R in hill roads

is given by

where V is the speed in kmph


146.The minimum design speed for hairpin bends in hill roads is taken as

20 kmph


147. The drain which is provided parallel to roadway to intercept and divert the water from hill slopes is known as catchwater drain


148. The walls which are necessary on the hill side of roadway where earth has to be retained from slipping is known as breast wall


149. In hill roads the side drains arc provided only on the hill side of road


150.a) Emulsion is used for stabilizing desert sand.

b) Soil lime stabilization is very effective for stabilizing black cotton soils.

c) Soil lime stabilization is quite effective in warm regions


151. For sandy soils the most common method of stabilization is soil bitumen stabilization


152. In which one of the following types of bituminous constructions is proportioning of materials determined from laboratory tests?

Bituminous or asphalt concrete


153. A road camber is given in Fig.


154. Which one of the following is associated with "Limiting Gradient" on highways? Requirement of maximum tractive effort for a short distance


155. While aligning a hill road with a ruling gradient of 1 in 20, a horizontal curve of

radius 80 m is encountered. The compensated gradient on the curve will be

1 in 25


156. While designing the superelevation of a highway, its maximum value is fixed

considering the need to avoid toppling of slow moving vehicles in mixed traffic flow


157. In the Group Index method of flexible pavement design, which one of the

following factors decides the thickness of base and surface course? daily volume of commercial vehicles


158. In a bituminous pavement, alligator cracking is mainly due to fatigue arising from repeated stress applications


159. The main function of prime coat is to provide bond between the existing

base and surfacing of new construction


160. The design of horizontal transition curve length for highways should take into

account three factors namely, allowable values of rate of change of centrifugal

acceleration and superelevation and the minimum length formula given by

the IRC

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