Answer Happy

SECTION B - HIGHWAY DESIGN AND CONSTRUCTION Q2. HIGHWAY SAFETY ENGINEERING DESIGN OF HIGHWAY INTERSECTIONS a) The following formula is applied in the design of horizontal curves: v² gR :=s+μ 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) major/minor c) Sketch the layouts of three basic types of single carriageway junctions and discuss the differences between such junctions. (6 marks) d) Explain the significance of sustainable development into road design and state at least ten goals of sustainable development throughout the road design lifecycle. (7 marks)