Q.1 a. What are the critical variables that affect the geometric capacity of Roundabout

School of Computing, Engineering & the Built Environment

Academic Session: 2024/5 Diet: Trimester 1

Module Title Traffic Engineering Design

Module Number CTR11731 Exam Duration 3 Hours

Total Time Available on the Exam Server 4 hours 30 minutes Total number of pages (incl. coversheet)  6

Number of Questions: 4

INSTRUCTIONS TO CANDIDATES: You must answer three questions out of four, and note that the exam will be marked out of 100. Question Number three (3) is compulsory

SPECIAL INSTRUCTIONS (PLEASE READ CAREFULLY)

1. This exam will be available for the exam duration plus 50% additional time to provide an inclusive approach to ensure that the requirements of those students who need additional exam time are already accommodated within this time period.
2. It is also intended to allow sufficient time for all students to upload materials and as mitigation for any temporary network problems during the exam.
3. No additional time can be added and late submissions cannot be accepted. Students should be able to complete the exam within the expected exam time period.
4. In your answer file you must ensure that all questions and pages are clearly numbered and that you include the module code and your student matriculation number.

If you cannot upload your answer paper, please make sure to send a copy of your answer paper to the Exams Team email address before the deadline of the exam.

If you have technical issues, the Exams Team can then manually submit on your behalf. Please note no late submission beyond the deadline of the exam can be submitted.

You should also retain copy of your answer file in case of queries. Please be aware that examination answer paper will be subject to plagiarism checks.

SPECIAL ITEMS attached to Exam Question Paper NONE

Q.1 a. What are the critical variables that affect the geometric capacity of Roundabout( 4 marks)

1. Use Kimber’s/DOT regression model to check the adequacy of capacity on all approaches to the roundabout shown in the Figure below.(25 marks)

1. What are the step that you will employ to improve safety on a roundabout on an Urban Motorway (Bullet Points) ?(4 marks)Total marks [33]

Q.2 a.  Define a Road Traffic Crash, and explain why it is a road traffic crash rather than a road accident. Explain three main factors (chain of events) that lead to a road traffic crash.(10 marks)

1. Draw four different scenarios (chain of events) in which a crash can occur . The four different scenarios are i) Residential Street,

ii) City Centre, iii) Urban Motorway, and iv) Rural Motorway. Consider the different land use pattern, traffic flow conditions, and user behaviour in these four scenarios.(16 marks)

1. What are the impact of a new transportation route that gets developed between a town and a major city on all three pillars of Sustainability, and what is your role as engineer to contribute towards sustainability of this project?(7 marks)
2. Total marks [33]

Q.3 a.  What are the design principles for design of a Traffic Signal type control of an Intersection, and how it is different from a priority Intersection. Under what conditions a traffic signal is more appropriate on a rural motorway.(4 marks)

1. Three stages are to be used for a new traffic signal installation at a four way junction, shown in Fig 3 and Fig 4. Using the data given in Tables 1 and 2, and the information provided below determine the most appropriate signal display times to minimise junction delays

Assume start/stop delay = 1.5 secs Intergreens = 6 secs

Table 1 Peak Hour Flows in pcus

Table 2 Saturation Flows(25 marks)

1. What are the design principles for design of a Traffic Signal type control of an Intersection, and how it is different from a priority Intersection. Under what conditions a traffic signal is more appropriate on a rural motorway.(4 marks)

 Total marks [33]