Question 7 5 marks A pavement which is 10 years old has a current rate of flow of 1180 commercial vehicles per day recorded a historic growth rate of 2.74% and a damage factor of 0.9. The standard deflection for this pavement was measured as 60 x 10?m. If a further 15 years of service is required from the pavement with the vehicle damage factor expected to be 1.09 and future growth rate for traffic is set at 4.5% over this time span, estimate the thickness of bituminous overlay required to provide sufficient strengthening. Assume a 0.4 probability level. Question 8 5marks A vertical curve road alignment is expressed as y = 0.000188x2 - 0.04x + 40. Determine the following: a. Elevation at PVC. mark b. Initial grade of the curve. mark c. Length of vertical curve if the final grade is 4.5%. 1mark d. The type of vertical curve. 1 mark e. Location of the high/low point of the vertical curve. 2 marks