A 2-lane, 2-way highway contains a spiral curve - circular curve - spiral curve which has been designed to connect two tangents of the horizontal alignment. The speed of this section of the highway is 70km/h. The following design principles are applied: The superelevation at the circular curve is 6%, The normal crown has a cross-fall of 2.5%, The width of a single traffic lane is 3.6m The length of the transition curve is 120m. a) Calculate the cross-fall for the cross-section of the carriageway at a distance of 30m from TS b) Present a drawing of the carriageway presenting the heights of the outside edge and inside edge of the carriageway relative to the centreline. (Provide all the references used for formulas/table values)