QUESTION RIVE

$*)$ On a proposed road having a design speed of $100$ kph and a carriageway width of $730$ m$.$ a composite curve consisting of two equal length cubic parabola transition curves and a central circular arc of radius $750$ m is to join two intersecting straights having a divfortion angle of $093428.$ The rate of change of radial acceleration for the road is to be $0\mathrm{.}3ms{s}_{-3}$ and the superelevation should be introduced at a rate of no more than $1$ N $.$

i$.$ Calculate the amount of superelevation that must be built into the central circular are.

ii$.$ Check that the trancition curves are long enough for the superelevation to be introduced.

iii. Calculate the amount of superelevation that should be constructed along the entry transition curve at $20$ m intervals from the entry tangent point

b$)$ The deflection angle between two intersecting straights is measured as $14{28}^{\text{'}}{26}^{\text{'}\text{'}}.$ The straights are to be joined by a composite horizontal curve consisting of a central circular arc and two cubic parabola transition curves of equal length. The design speed of the road is $85$ kph and the radius of the circular curve is $600$ m $.$ The rate of change of radial acceleration is to be $0\mathrm{.}3ms-3.$ If the through chainage of the intersection point is $461\mathrm{.}34$ m $,$ prepare the setting out tables for the three curves such that pegs can be located on the centre line at exact $20$ m multiples of through chainage using the tangential angles method