Complete this assignment in teams of four (4). Each team member should solve the problem independently and thereafter compare the solutions and discuss among themselves the differences in answers, if any. And finally submit one solution.
Due date: Wednesday of Week 6 COB
Submit to: Assignment Minder
Problem 1 – Traffic flow theory and fundamentals (4*3=12% weight)
(a) From a point beside a road, a one way and one lane traffic stream is observed to consist of:
x A stream of cars travelling at 60 km/h with average headway of 8 seconds x A stream of trucks travelling at 40 km/h with average headway of 12 seconds Determine the LOS for the traffic stream. Assuming passenger car equivalent for cars and trucks as 1 and 1.5, respectively and Level of service (LOS) threshold for the given road as follows:
Table 1.1 LOS thresholds for Problem 1a
LOS Density Range (pc/km/ln)
A 0-7
B 7-11
C 11-16
D 16-22
E 22-28
F 28
Other requirements for Problem 1a x Submit your hard copy so that your working can be tracked.
(b) Two vehicles pass over two closely spaced loop detector. Each detector has a detection zone of 2 m and the distance between the upstream edges of the two detection zones is 5 m. The time on (ton) and time off (toff) for each vehicle and for each detector in 1/30 second units are shown in the following table. Estimate the traffic density.
Table 1.2 Detector data for Problem 1b
Vehicle Detector Time-on
ton Time-off
toff
1 A 16 27
B 25 36
2 A 141 152
B 150 161
Other requirements for Problem 1b x Submit your hard copy so that your working can be tracked.
(c) Existing six-lane freeway (three lanes each direction) is growing in urban area. Using tables and equations provided in the class notes on Blackboard, calculate when should a fourth lane be added in each direction to avoid excess of demand over capacity. Assume commuter traffic and freeway design for sub urban area.
Table 1.3 Parameters for Problem 1c
5,500 veh/h (one direction, existing). Traffic grows at 3% per year
Level terrain: Assume ET =1.5
Free flow speed (measured in field): 100 km/h
9% trucks (HV) on freeway PHF 0.92
Other requirements for Problem 1c x Since no information is given on possible changes over time, assume that 9% trucks, PHF and FFS remain constant. x Assume 0% buses and RVs x Assume commuter traffic x You can round your answer to three significant digits when displaying answers. x Submit your hard copy so that your working can be tracked.


Problem 2 – Unsignalised Intersection (8% weight)
You have been asked to prepare a transport impact assessment for a proposed residential estate off Zinglemann Road at Klemzig. Figure 2.1 illustrates the “with-site” opening year weekday PM peak hour traffic projections for the year 2018 at the adjacent stop-controlled cross intersection of Zinglemann Road and Old School Road.
Assume that any pedestrians (flows not shown) give way to vehicle traffic. Assume that average queue storage required per vehicle is 6.0m. Stating any other assumptions you need to make, conduct an unsignalised intersection analysis in a spreadsheet table according to the following procedure:
(i) Identify the movement hierarchy at this intersection.
(ii) With the aid of Table 1 from your current EGB272 lecture slides (after Austroads 2010), stipulate the gap acceptance parameters for each opposed movement.
(iii) For each minor movement, identify the whole stream of opposing movements. Calculate the opposing flow using the methodology described in the current EGB272 lecture slides, and where applicable, the impedance of each opposed movement.
(iv) Estimate the capacity and degree of saturation of each movement using the theory described in the current EGB272 lecture slides. (Assume that the capacity of a major stream through movement is 0.5veh/s/ln and that of a left turn movement is 0.4veh/s/ln.)
(v) Estimate the capacity and degree of saturation of each lane. Compare with the standard unsignalised intersection practical degree of saturation of 0.80.
(vi) Estimate the average control delay of each lane and its HCM Level of Service from the table in the current EGB272 slides.
(vii) Estimate the design 95th percentile queue length on each lane. Identify for each right turn lane whether queue storage as shown in Figure 2.1 is adequate. Identify any implications to traffic on other lanes.
(viii) Discuss the suitability of the existing intersection form for opening year PM peak hour conditions.
Other requirements
x Use a tabulated spreadsheet to complete this Problem.
x Numbering of the movements in your response must be the same as those shown here. In your spreadsheet, your movement calculations must be ordered in rows from the lowest to highest movement down the page. For each movement clearly carry your calculations in rows right across the spreadsheet and be consistent with placement of these calculations for all movements.
x In your spreadsheet, your lane calculations must be ordered in rows according to the following convention: S1, S2…; E1, E2…; N1, N2…; W1, W2…
x Use sensible rounding when displaying answers on your spreadsheet (Excel has a displayed rounding tool, while still carrying the values to a high level of significance throughout the calculations): Display flow rate to three decimal places, probability to three decimal places; degree of saturation to two decimal places; delay to nearest whole second; queue length rounded upwards to nearest whole vehicle.
x Submit clearly labelled your electronic spreadsheet on electronic media with your hard copy so that your working can be followed.