a) The following formula is applied in the design of horizontal curves: V2 =s+μ gR Explain the meaning of all terms repr

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a) The following formula is applied in the design of horizontal curves: V2 =s+μ gR Explain the meaning of all terms represented in this equation and demonstrate their relationship in a sketch. Discuss the importance of superelevation in the context of highway safety engineering, including reference to the typical traffic accident types associated by it. (6 marks) b) For a particular circular curve of radius 150 m, the road surface has a sideways force coefficient of friction of 0.20. Determine the speed (in km/hr) at which sliding will occur for each of the following three conditions and comment in principle on the possibility of vehicles overturning in these situations. (Assume g = 9.81m/s²). ● The road surface has an adverse crossfall of 2.5% The road surface is flat ● The road surface has 6% superelevation (6 marks)