Comparison Of Intersection Performance - Engineering Assignment Help

Assignment Task

Comparison of Intersection Performance 
An unsignalised T-intersection at Bayview Avenue and Clayton Road is one of the main access point to Monash University Clayton Campus. It has been experiencing considerable delays and excessive queuing on one of its approaches during the afternoon peak period. 
A traffic survey conducted by students of CIV2282 from previous years, over a 15-minute period during the afternoon peak times, giving the turning movement counts shown in Table 1 for the movements shown in Figure 1:

Table 1 – Existing turning movement counts

Each approach has two lanes, each movement operates in its own lane and there are no shared lanes. 
In order to address the excessive queuing problem, a proposal has been received to change the intersection control to either a roundabout or a signalised intersection. You have been asked to compare the performance of the intersection under the current (unsignalised) control with it operating as a roundabout and as a signalised intersection. Assume the space is sufficient to host signalling devices or roundabout facilities.
To do this, you should:
• Calculate the proportions of vehicles that have to stop, for all six movements in all three intersection configurations.
• Calculate the average delays per vehicle (average time in the ‘system’) in all three intersection configurations – for the six movements, for the three approach roads, and for the intersection as a whole.
• Calculate the 95th percentile queue lengths (that which is exceeded only 5% of the time), for the six movements in the unsignalised and roundabout configurations.
• Calculate the maximum queue lengths, for the six movements in the signalised configuration.

Question 3: Signalised Intersection
You can assume that if the intersection were to be reconfigured as a signalised intersection, the existing lane discipline would be maintained. That is: each approach has two lanes, each movement operates in its own lane and there are no shared lanes. 
Saturation Flows are assumed to be 1700 veh/h for through movements, 1670 veh/h for protected right turn movements, and 1570 veh/h for left turn movements. 
The intersection would operate as a three-phase timing plan, with a leading protected right turn from the east approach (Movement 6 in Figure 2 below). 
Inter-green times and minimum displayed green times are assumed to be 4 seconds and 7 seconds respectively for all movements, resulting in lost times and minimum effective green times also of 4 seconds and 7 seconds respectively. 
An initial cycle time of 100 seconds can be assumed, this will need to be revised in your calculations to give a value between the optimum and practical cycle times. 
The Signalised Intersection Analysis Worksheet presented in Week 7 may be useful for this assignment. 
Include a large, clear diagram of the intersection operating in this configuration, and a movement diagram showing which movements operate in which phases and the critical movements. You should show all of your calculations, neatly presented in Tables and Figures that are referenced in the text of your report. 

Question 4: Comparison [10 marks]
Comment on the relative performance of the intersection under the three control methods. This comparison would include tables and graphs of the various performance measures that you have obtained, as well as a few paragraphs describing your findings and an overall recommendation as to which control method would be preferable.

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