A two-lane road in plain terrain with a design speed of 60 km/h has a horizontal curve of radius 180 m. The rate of superelevation to be adopted for the horizontal curve, taking three-fourths of the design speed for mixed traffic conditions as per IRC guidelines, is approximately:

Given that the minimum clearance distance S between overtaking and overtaken vehicles (both before and after overtaking) is 30 m, and the acceleration capacity of the overtaking vehicle is a = 1.3 m/s2, calculate the time required for the actual overtaking operation (T).

In a light rainfall area, a Major District Road (MDR) with a 4 m wide WBM pavement (camber 1 in 40) and a State Highway (SH) with a 7.5 m wide Bituminous Concrete pavement (camber 1 in 50) are constructed. What is the crown height (in metres) relative to the pavement edges for these roads, respectively?