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Highway Engineering

Updated: Jul 23, 2020

1 Nagpur road plan formulae were prepared by assuming-radial or star and grid road pattern.

2 Second 20-year plan has provided 1600 km of expressways out of the

proposed National highway.

3 sequence of four stages of survey in a highway alignment is-map study, reconnaissance, preliminary survey and detailed survey.

4 The shape of the camber, best suited for cement concrete pavements, is-straight line.

5 For water bound macadam roads in localities of heavy rainfall, the recommended value of camber is-1 in 36.

6 The stopping sight distance depends upon-total reaction time of driver,speed of vehicle,efficiency of brakes.

7 When the path travelled along the road surface is more than the circumferential

movement of the wheels due to rotation, then it results in-skidding.

8 Coefficient of friction is less when the pavement surface is-smooth and wet.

9 The shoulder provided along the road edge should be-rougher than the traffic lanes.

10 Camber in the road is provided for-effective drainage.

11 Compared to a level surface, on a descending gradient the stopping sight distance is-more.

12 On a single lane road with two way traffic, the minimum stopping sight

distance is equal to-two times the stopping distance.

13 The desirable length of overtaking zone as per IRC recommendation is equal to-five times the overtaking sight distance.

14 Stopping sight distance is always-less than overtaking sight distance.

15 Reaction time of a driver-decreases with increase in speed.

16 If the stopping distance is 60 metres, then the minimum stopping sight distance for two lane, two way traffic is-60 m.

17 The effect of grade on safe overtaking sight distance is-to increase it on both descending and ascending grades.

18 The ruling design speed on a National Highway in plain terrain as per IRC

recommendations is-100 kmph.

19 The terrain may be classified as rolling terrain if the cross slope of land is-between 10% and 25%.

20 The maximum width of a vehicle as recommended by IRC is-2.44 m.

21 Traffic volume is equal to-traffic density x traffic speed.

22 On a right angled road intersection with two way traffic, the total number of conflict points is-24.

23 The background colour of the informatory sign board is-yellow.

24 warning sign-level crossing.

25 "Dead Slow" is a-regulatory sign.

26 Centre line markings are used-in roadways meant for two way traffic.

27 Maximum number of vehicles can be parked with-90° angle parking.

28 tests measures the toughness of road aggregates -impact test.

29 Los Angeles testing machine is used to conduct-abrasion test.

30 The maximum allowable Los Angeles abrasion value for high quality surface

course is-30%.

31 The ductility value of bitumen for suitability in road construction should not be

less than-50cm.

32 The maximum limit of water absorption for aggregate suitable for road construction is-0.6%.

33 Penetration test on bitumen is used for determining its-grade.

34 Bitumen of grade 80/100 means-its penetration value is 8 to 10 mm.

35 Softening point of bitumen to be used for road construction at a place where maximum temperature is 40° C should be-greater than 40°C 36 For rapid curing cutbacks, the oil used is-gasoline.

37 The method of design of flexible pavement as recommended by IRC is-CBR method.

38 Bottom most layer of pavement is known as-subgrade.

39 Tie bars in cement concrete pavements are at-longitudinal joints.

40 The maximum spacing of contraction joints in rigid pavements is-4.5m.

41 The maximum thickness of expansion joint in rigid pavements is-25mm.

42 The camber of shoulders in water bound macadam roads is-equal to the cross slope of pavement.

43 In highway construction, rolling starts from-sides and proceed to centre.

44 In the penetration macadam construction, the bitumen is-sprayed after the aggregates are spread and compacted.

45 The suitable surfacing material for a bridge deck slab is-mastic asphalt.

46 The thickness of bituminous carpet varies from-20 to 25 mm.

47 In highway construction on superelevated curves, the rolling shall proceed from-lower edge towards the upper edge.

48 Expansion joints in cement concrete pavements are provided at an interval of-18 m to 21 m

49 Dowel bars are provided in longitudinal joints 50 The camber for hill roads in case of bituminous surfacing is adopted as-2.5%.

51 The minimum design speed for hairpin bends in hill roads is taken as-20 kmph

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

53 The walls which are necessary on the hill side of roadway where earth has to be

retained from slipping is known as-breast wall.

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

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