A National Highway (high type bituminous surface) with design speed of 80 km/h and normal pavement width of 7 m, passing through a rolling terrain in heavy rainfall area has a horizontal curve radius 500 m and need to be extra widened at the curve. Calculate the extra widening required if the longest wheelbase of vehicle expected on the road is 6m. This highway goes from normal crown to desired super-elevation by means of a spiral transition curve. If the super-elevation is attained by rotating the road section around its inner edge, draw a cross-section of the road and show the super-elevated height at section where (a) crown rate is achieved and (b) full super-elevation is achieved. (Assume allowable rate of introduction of super-elevation be 1 in 150)
A National Highway (high type bituminous surface) with design speed of 80 km/h and
normal pavement width of 7 m, passing through a rolling terrain in heavy rainfall area has
a horizontal curve radius 500 m and need to be extra widened at the curve. Calculate the
extra widening required if the longest wheelbase of vehicle expected on the road is 6m. This
highway goes from normal crown to desired super-elevation by means of a spiral transition
curve. If the super-elevation is attained by rotating the road section around its inner edge,
draw a cross-section of the road and show the super-elevated height at section where (a)
crown rate is achieved and (b) full super-elevation is achieved. (Assume allowable rate of
introduction of super-elevation be 1 in 150).
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