It is required that two intersecting straights are joined by a circular arc and transition curves. Use the following data to select a suitable road alignment: The minimum radius ( R ) which can be used is 420m Rate of change of radial acceleration, r= 0.3m /s 3 Deflection angle between 2 tangents, I= 43 0 20’10’’ Equation relating length of transition curve to angle; so that total length of curve , Design Speed of Road, V= 80km/hr 2.Calculate length of central circular arc ( C2.1; C2.3; FP1.6; FP3.7) ; 3.Calculate total arc length if curve totally transitioned ( C2.1; C2.3; FP1.6; FP3.7)