CVEN30011 - Traffic Operation and Management - Engineering Assignment Help

Assignment Task

Task
With the introduction of the SRL station in the proximity of the selected intersection, pedestrian flows are likely to increase in the area. To accommodate such flows, traffic
signals can have adaptative plans that vary based on the rail schedule to improve pedestrian access/egress close to train departure/arrival times.
Your task will be to design signal timing plans for the designated intersection. First you will design the plan without pedestrian priority consideration, and then you will propose a mechanism to adapt this plan to increase the level of service of pedestrian access to the station.
You should define the movements and mode specific volumes based on the attached dataset . Further information about traffic detectors is
provided in Appendix A. Calculation explanations and formulas for signal timing design are provided in the lecture materials and Appendix B. Further information and
calculation examples are available via the links provided in the lecture material.

Question 1
Draw an intersection representation diagram. Label the width of pedestrian crosswalks (if crosswalks do not exist for all approaches, please add them into your intersection), width of the intersection, road names, and posted traffic speeds for each leg of the intersection.

Question 2
Calculate the peak hour volumes and peak 15-minute volumes of traffic at the existing intersection for each movement by providing an average per-lane value.
Clearly label the approach and movement when presenting your results.
Traffic detector volumes are provided for individual lanes. Aggregate all lanes with the same movement and provide an average per lane-volume for each movement (e.g. if Detectors 1, 2, and 3 are all east approach through movements, the average per-lane value = Peak Volume Detector 1+ Peak Volume Detector 2+ Peak Volume Detector 33).
Some lanes will have shared movements (e.g. through/left turn) – make an assumption regarding the distribution of traffic between these movements (e.g. 80% through, 20% left turn). Use the traffic data and associated signal detection diagram image provided in Appendix A. Ignore tram lane volumes and departure lane volumes if present. Some lanes will not have detectors and associated volumes – these can be assumed relative to other volumes at this intersection. Clearly state your methodology and any assumptions made.
Hint: Tutorial 2 of Module 7 (4-7 October) will help you with this question. 

Question 3
Propose a phasing plan based on the composition of traffic volumes identified in Question 2. Consider whether pedestrian and vehicle turning movements are protected
and ensure you account for all traffic, tram (if applicable), and pedestrian movements in your phase diagram. Label each phase alphabetically; consistent phase labelling should be carried throughout the following questions.

Question 4
Identify the critical movement and calculate the length of the intergreen period for each phase of your cycle.
N.B. Formulas are provided in Appendix B. Clearly state any assumptions you have made.

Question 5
Calculate the minimum green time for each phase based on the pedestrian crossing time and intergreen time calculated in the previous question. Assume the
WALK signal will be illuminated for approximately 7 seconds.

Question 6
Calculate the design flow rate for each lane using the calculated peak hour volumes and peak hour factor from your traffic data.

Question 7
Identify the critical movement for each phase, and calculate the critical flow ratios assuming a saturation flow rate of 1900 veh/lane/hour.

Question 8
Calculate the optimum cycle length. Round this value up to the nearest 5 second interval. Calculate the total available green time for the cycle. N.B. Subtract the intergreen period for each phase from the optimum cycle length to determine the total available green time.

Question 9
Allocate the proportion of available green time for each phase using the critical flow ratios and total available green time previously calculated for the cycle.

Question 10
Draw a phase and signal timing cycle diagram that clearly shows the signal timing across each phase. Clearly label the intergreen periods (yellow + red, assuming red = 2 seconds) and green intervals. An example diagram is presented in Appendix C.

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