1- project, report and presentation 25%
Tasks Detailed Brief:
Project Task 1
Highway projects need analysis and design of various sections of the road network. As a highway engineer, you have been asked to perform the tasks outlined below according to the standards specified by Ministry of Highway and Transport Engineering in UK.
You will have to conduct comprehensive design tasks for this project, requiring feasibility study, design and construction of a vertical curve road.
Your project’s design model should include:
- Vertical Curves design- Vertical curves are parabolic curves used to achieve a gradual change between tangent grades (G1 and G2) and may be either a crest curve or a sag curve as shown in Exhibit 1.
- Crest Vertical Curves Stopping Sight Distance Design- Using the general equations for calculating the minimum length of crest vertical curves based on the required sight distance and the algebraic difference in grade.
- Crest Vertical Curve Passing Sight Distance- Design values of crest vertical curves for passing sight distance differ from those for crest stopping sight distance because of the different sight distance and object height criteria. The required passing sight distance for various design speeds can be obtained from Table 1 shown below.
Design Consideration parameters:
Your design of roadway curves should be based on an appropriate relationship between design speed and curvature and on their joint relationships with superelevation and side friction.
Project Task 2
A CSS (County Surveyors` Society) study has highlighted the need for improved design guidance for mini-roundabouts that would allow improvements to be made in the selection of sites and the design of existing and proposed junctions. Traffic Management Division also believes that improved design guidance is required in this area. Mini-roundabouts are increasingly being used in schemes where traffic calming measures are being introduced. There is little design guidance and schemes often attract complaints from the public.
To provide technical input and design and advice on mini-roundabout design, you will have to conduct comprehensive design tasks for this project, requiring feasibility study, design and construction of mini roundabout. Sample mini-roundabout sketch as shown in Exhibit 3.