48370-Road and Transport Engineering Report Writing - Engineering Assignment Help

Assignment Task

Task

Assessment Task:

Allawah, Carlton and Kogarah Bay Traffic Management.

The local communities of Allawah, Carlton and Kogarah Bay situated in the Georges River Local Government Area are concerned about road traffic congestion and speeding within the vicinity of Park Road and Princes Highway. The specific area of concern is presented in

Figure 1.

The study area consists of a number of different land uses including a schools, commercial and leisure activity centres, and at the northern end of Lancelot Street (north of Park Road), the Allawah Train Station.

Your consultancy firm has been asked by governing authorities to complete an assessment of the traffic conditions to quantify, evaluate and resolve some of the communities concerns. As the lead Traffic Engineer, you are faced with the problems described in the following pages of the brief. 

Problem 1: Southbound Speeding along Park Road.

Residents have noticed the presence of speeding vehicles travelling southbound along Park Road, north of the intersection at Princes Highway.

In order to investigate the complaint, a traffic survey has been conducted on Park Road (highlighted in red). The survey used automatic tube vehicle counts (pneumatic tubes) which collected speed and volume data between 07/03/2022 and 13/03/2022 (7 day survey period). 

a) Within the provided data set are there observations where zero vehicles were recorded (Flow = 0)? Hypothetically if we did observe zero vehicle data, do we include this data in our assessment? Discuss the potential issues of including and excluding these observations within our data set.  

b) What is the speed limit of Park Road for the direction of travel that residents are concerned about? Is the speed limit appropriate in the context of the adjacent land uses and connectivity to the rest of the road network? Justify your response with clear reasoning. 

c) Determine the daily time mean speeds and the time mean speed for the entire survey period for both directions of travel.

d) Determine the daily space mean speeds and the space mean speed for the entire survey period for both directions of travel. 

e) Using the data provided, what proportion of average speed (across an hour) measurements were in excess of the posted speed limit (considering both directions of travel)? Is speeding a problem based on the findings of part c), d) and e)? Can this assessment alone validate or invalidate the residents concerns? Justify your response with clear reasoning. 

f) Using the fundamental relationships of traffic flow and linear regression (use Microsoft Excel) define the Greenshields model (speed-density relationship) for ONLY the southbound direction of Park Road. Briefly describe your methodology and clearly identify the mathematical relationship. 

g) Is the derived model a good fit for the observed data? Use a statistical measure to justify your answer. 

h) Based on the results of part f) determine the mathematical relationship (present the equations) between speed and flow as well as the relationship between flow and density.

i) Based on the Greenshields model, calculate the following properties of the southbound direction of Park Road: 

i. Free flow speed
ii. Jam density
iii. Capacity

j) Considering the analysis completed in parts c) to i), discuss the traffic conditions on Park Road and the response you would provide to the residents regarding their complaint. What further data collection would you complete to provide a more comprehensive assessment? Cleary justify your response

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