Highway Engineering Memory Capsule


πŸ‘‰ Border Roads Organisation for hilly regions, was formed in 1960


πŸ‘‰ For the movement of vehicles at an intersection of two roads, without any interference, the type of grade separator generally preferred to, is CLOVERLEAF

 

πŸ‘‰ The minimum ratio of the radii of two circular curves of a compound curve, is kept 1.5


πŸ‘‰ The minimum value of camber provided for thin bituminous surface hill roads, is 2.5%


πŸ‘‰ Road markers along roads from the edge of a kerb should not be less than 60cm


πŸ‘‰ The usual width of parapet walls along Highways in hilly region, is 60cm


πŸ‘‰ According to Highway Research Board of U.S.A. practical land width, is 3.6m


πŸ‘‰ The basic formula for determination of pavement thickness was first suggested by GOLDBECK


πŸ‘‰ Deviation of the alignment of a trace cut may be permitted in areas involving LANDSLIDE


πŸ‘‰ According to the recommendations of Nagpur Conference, the width formation of an ideal National Highway in hard rock cutting, is 7.9m


πŸ‘‰ On the recommendations of Indian Road Congress, the ruling gradient in plains, is 1 in 30


πŸ‘‰ The head light of vehicles should be such that its lower beam illuminates objects at 30m


πŸ‘‰ The length of the side of warning sign boards of roads is 45cm


πŸ‘‰ Minimum thickness of a layer of fine sand required to cut off capillary rise of water completely, should be 76cm


πŸ‘‰ At a road junction, 7 cross conflict points are severe if, one is two-way road and other is one-way road


πŸ‘‰ To indicate proper control of consistency of a freshly mixed concrete for pavement construction, the slump should be between 7 to 10cm


πŸ‘‰ The width of different roads as recommended in Nagpur plan by the Indian Road Conference for hilly region, is different for National highway


πŸ‘‰ For the administration of road transport, a Motor Vehicle Act was enacted in 1939


πŸ‘‰Along high ways confirmatory route markers are generally fixed, after the crossing on the left 

side


πŸ‘‰ Transverse joints are provided at distances varying from 17 to 27m


πŸ‘‰ To prevent movement of moisture from subgrade to road pavement at the same level as that of water-table, thickness of a cut off layer of coarse sand, is 15cm


πŸ‘‰ For Indian conditions, the water bound macadam roads, are suitable if daily traffic does not exceed 2000 tonnes


πŸ‘‰ For maximum strength and durability minimum percentage of cement, by weight is 30%


πŸ‘‰ The minimum vertical clearance of overhanging cliffs or any other structure above the surface of a hill road, should be 5m


πŸ‘‰ The usual width of side drains along Highways in hilly region, is 60cm


πŸ‘‰ Normal formation width of a hill road for one-way traffic, is 4.8m


πŸ‘‰ Minimum thickness of the base of a flexible pavement, is 10cm


πŸ‘‰ An Executive Engineer of roads, executes works under direct control of Superintending Engineer


πŸ‘‰ Newly constructed pavement with ordinary Portland cement attains its working strength after 28days


πŸ‘‰ If the radii of a compound curve and a reverse curve are respectively the same, the length of common tangent of both curves will be equal


πŸ‘‰ From the point of tangency before an intersection, the route markers are fixed at a distance of 100 to 150m


πŸ‘‰ For a poorly graded sub-grade soil, thickness of sub-base, is 30cm


πŸ‘‰ For clear distinct vision, images of obstructions should fall on the retina with a cone of 5°


πŸ‘‰ The minimum width of the pavement of a National Highway should be 5.7m


πŸ‘‰ An exceptional grade may be provided upto 1 in 12 along hill roads, if the length does not exceed 60m per Km


πŸ‘‰ If a Lemniscate curve having an angle of deflection Ξ”, is transitional throughout, the maximum polar angle is ∆/6


πŸ‘‰ On most smooth hard surfaced roads, rolling resistance to moving vehicles, ranges from 9 kg to 11 kg/tonne


πŸ‘‰ Width of a rotary round should be equal to width of the widest road plus the width of one lane


πŸ‘‰ For a 6.6 m wide two lane pavement, berms are provided on either side having a width of 1.5m


πŸ‘‰ For the design of cement concrete pavement for corner loading, Indian Road Congress recommends the use of Picker's Formula


πŸ‘‰ I.R.T.D.A. (Indian Roads and Transport Development Association) was set up at Bombay in 1927


πŸ‘‰ Thickness of broken line markings on multilane road for lanes is generally kept 10cm

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