49106 Road Engineering Practice First Assignment Spring 2016 Assignment due 5 September 2016 Question 1 (4 marks) A side track has been designed to divert traffic away from the construction site of a major highway. The side track has one lane in each direction. It has the following cross section: 2 x shoulders = 1.5 m each 2 x trafficked lanes = 3.2 m each Total cross section = 9.4 m The side track is located between Type F concrete barriers on each side located on the edge of the shoulders. These barriers form an obstacle to vison around curves. The side track has a minimum horizontal radius of 250 m with 3% adverse superelevation. The proposed design speed is 60 km/hr .Check this side track for horizontal curve design and horizontal stopping sight distance for cars. Use the appropriate values in the RMS Austroads Guide Supplement dated 12 August 2015. Question 2 (2 marks) Explain why it is desirable to design the lane width for a trafficked lane as 3.5 metres and the shoulder as 3 metres when designing a high speed rural road with high heavy vehicle volumes. Question 3 (2 marks) Explain the difference between a design vehicle and a checking vehicle in road design. When designing a rural road connecting two major towns, what design and checking vehicles would you use? In your answer provide a brief explanation. Question 4 (4 marks) Constructability is an important feature of a good road design. What are the major constructability issues you would consider in the design of a road in an urban area? The length of your answer should be 300 words (plus or minus 10%). Question 5 (2 marks) Cyclists and pedestrians need special consideration when designing a road. List four road safety measures which should reduce the risk of crash related injury or death for these road users. Question 6 (4 marks) What is manoeuvre sight distance? Explain your answer with a diagram. What is the manoeuvre sight distance for a car on a road with a design speed of 100 km/h? Question 7 (2 marks) There are a number of important human factors that need to be considered in road design. Select of the most important and discuss their relevance to road engineering.