This portfolio contribute 50 marks out of 100 marks. It consist of three independent assessment task. This assessment focus on weeks 1 to 6 content.

This assessment item relates to the unit learning outcomes 1, 2, 5 and 6. It develops students' ability to understand capacity analysis procedures for both roadways and intersections using current Australian Guidelines and Design Practices. Use of SIDRA software (intersection design software) is highly recommended when applicable.

Quizzes (10 Marks):

Complete three Moodle quizzes

More detail avialable in Moodle

Roadway Capacity Analysis Task (16 Marks):

Road Authority in Victoria is currently considering to upgrade an existing suburban multilane road to a freeway in Melbourne due to severe traffic delays (based on the public complaints) during peak periods. As a traffic engineer working at Road Authority in Victoria, you were asked to collect data for the existing condition, analyse the existing condition and recommend whether converting the multi lane road to the freeway improves capacity and level of service. Over several months, you collected the following data:

Existing multilane road:

• Lane width of 3.6m (12ft), total lateral clearance 1.8m (6ft) and about 6.25 access points per km (10 points per mile)
• Two lanes per direction, divided multilane road in rolling terrain
• Observed base free flow speed of approximately 80km/hr (50mi/hr)
• Observed directional flow of (3000 + last four digits of your student ID ÷ 10) with corresponding PHF=0.90 and 2% trucks.
• All motorists seem to be commuters or regular facility users.

Proposed freeway data:

• Lane width of 3.6m (12ft), left side lateral clearance 0.9m (3ft) and about 2.5 ramps per km (4 ramps per mile)
• Two lanes per direction, freeway in rolling terrain
• Observed base free flow speed of approximately 110km/hr (70mi/hr)
• Directional traffic flow is expected to increase by 25% including trucks but PHF is expected to remain the same.
• All motorists are expected to be commuters or regular facility users.

Consider the following types for analysis (ignore the costs of converting multilane road to freeway):

• Multilane road- existing case (6 marks)
• Freeway (6 marks)

Also, compare and provide a detailed discussions on analysis outcomes. (4 marks).

Intersection Capacity Analysis Task (24 Marks)

A City Council received a number of complaints about excessive delays at one of their local street intersection during morning peak period at the City Centre. As a traffic engineer working for the City Council, you were tasked with providing the best engineering solution to remedy the problem (if there is a problem). You performed a site visit and the following observations were made:

• The intersection connects two-lane two-way cross-roads at approximately 90 degree angle.
• There are right-turning lanes on North-South road. But site condition is such that one right- turn lane could be added on East-West road too but there is no space for left-turning slip lanes or additional through lanes. Small roundabout could also be considered.
• There were virtually no trucks during morning peak period.
• Currently, the intersection is un-signalised and East-West road needs to GIVE WAY to North- South traffic.
• Speed limit is 60km/hr at all approaches.
• There is not much variation of traffic flow rate within morning peak hour.
• Traffic volumes (veh/hr) during the peak period were observed as follows:
• From South: 200 (left turn), 500 (through) & 100 (right turn)
• From East: 150 (left turn), 100 (through) & 400 (right turn)
• From North: 100 (left turn), 500 (through) & 100 (right turn)
• From West: 150 (left turn), 100 (through) & 200 (right turn)
• No annual traffic growth is expected for foreseeable future.
• Other information can be assumed within Australian Standards and guides.

Consider the following types of intersections for manual analysis and design:

• Un-signalised intersection- existing case (3 marks)
• Un-signalised intersection- modified (3 marks)
• Roundabout (3 marks)
• Signalised intersection (3 marks)

Compare your manual analytical solutions with the outputs from SIDRA. Provide reason/s if there are any variations in the outputs. (9 marks)

Also compare alternative intersection controls and recommend the best intersection type (3 marks).

The marking matrix shall be based on the content consisting of the following principles. Each sequential step shall be allocated marks proportionately

1. Accuracy of Input parameter for each computation step with appropriate unit. Marks will only be awarded for correct input
2. Application of accurate methodology with appropriate referencing. Full mark will only be awarded for error free computational steps with appropriate explanation to be understood by an independent person.
3. Accuracy of answer with appropriate unit. Zero mark will be awarded with error in either Input or methodology.
4. If answers to any preceding steps are inaccurate. Partial mark be awarded for subsequent answers.

Additional information should be obtained from the Moodle Unit web-page

This assessment item relates to the unit learning outcomes 3, 4, 5 and 6. It develops students' ability to understand Australian pavement design system, materials and tests and design of alternative pavement configurations (flexible pavements, rigid pavements and structural overlays) using current Australian Guidelines and Design Practices. Use of CIRCLY software (pavement design software) is highly recommended when required.

• Quiz (5 Marks)

  Complete quizzes online.

  More details avialable in Moodle

  Laboratory Task (10)

  • You will complete the practical activities and the laboratory report as a team.
  • On-campus students will complete the practical activities between Weeks 5 and 9 of term.
  • Each team should check their schedule timetable as shown in Moodle
  • Distance students will complete the practical activities during the Residential School in Week 8.
  • All teams will upload a single team report due as per the Unit Profile.
  • The required practical activities are as follows
  • Preparation disturbed soil sample for testing
  • Soil Compaction and density test AS1289.5.2.2017
  • Determination of the penetration resistance of a soil AS1289.6.3.2
    
  • Determination of the California Bearing Ratio of a soil AS1289.6.1.1
    
  • Lime demandof soil Q133
    

  Design Task 1: Flexible pavement design (20 marks)

  Geometric design, earth moving and subgrade evaluation of a new two-lane two-way road has been recently completed and now it is time for design of pavement in rural Queensland. A new flexible pavement is to be designed and you are tasked to develop flexible pavement alternatives for further consideration. The following are the project specific information supplied by the client (Road Authority in Queensland):

  

  • Two way total AADT=4000+(the last four digits of your student ID)/10
  • Pavement design period 30 years.
  • Project reliability 95%.
  • Lane width= 3.5m.
  • Directional distribution 60/40
  • Subgrade CBR value = 3 (if the last four digits of your student ID is < 3000), 5 (if the last four digits of your student ID is ≥ 3000 but < 6000) and 7 (if the last four digits of your student ID is ≥ 6000)
  • Heavy vehicles = 8% (if the last four digits of your student ID is < 3000), 9% (if the last four digits of your student ID is ≥ 3000 but <6000) and 10% (if the last four digits of your student ID is ≥6000)
  • Annual heavy vehicle growth is 1% throughout the design period
  • Other required information can be assumed within Australian Standard (Austroads Guides)

• Summarise and calculate required flexible pavement design input parameters (4 marks)
• Design the following flexible pavement alternatives using mechanistic or graphical methods (as applicable, appropriate or preferred!). You need to draw final design drawings for all cases (not to scale is acceptable but indicate all required dimensions and units of measurements). You must discuss/interpret everything you calculate or present.
• Alternative 1: Unbound granular pavement with thin bituminous surfacing (3 marks)
• Alternative 2: Full depth asphalt (E=2500MPa) (3 marks)
• Alternative 3: Asphalt (E=3500MPa) with granular base (E=550MPa) (5 marks)
• Alternative 4: Asphalt (E=2200MPa), granular base (E=550MPa), cemented subbase (E=5000MPa) (5 marks)

Design Task 2: Rigid Pavement design (10 Marks)

For the same road location and information (described above in Design Task 1), Road Authority in Queensland also asked you to develop rigid pavement design alternatives.

• Summarise and calculate required rigid pavement design input parameters (2 marks)
• Design the following rigid pavement alternatives using analytical or graphical methods (as applicable or appropriate or preferred!). You need to draw final design drawings for all cases (not to scale is acceptable but indicate all required dimensions and units of measurements). You must discuss/interpret everything you calculate or present.
• Alternative 1: PCP pavement without concrete shoulder (4 marks)
• Alternative 2: CRCP pavement with concrete shoulder (4 marks)

Design Task 3: Design of Flexible Asphalt Overlay (5 Marks)

A homogeneous section of a cracked asphalt surfaced granular pavement is situated in Brisbane where the WMAPT is 32°C. As the existing asphalt is cracked, it is proposed to mill 25 mm from the existing 50 mm thick asphalt prior to asphalt overlay. The following characteristic values were calculated from deflectograph deflection testing undertaken at a pavement temperature of 25 °C:

• Measured Characteristic Deflection at 25°C = 0.87 mm
• Measured Characteristic Curvature at 25°C = 0.30 mm.

Based on experience, the client (Road Authority in Queensland) advised that the designer considered that there was no need to apply a Seasonal Moisture Correction Factor to these measured deflections and curvatures. The design traffic loading (ESA) for this section is the same as described above (Design Task 1).

• Design asphalt overlay on asphalt surfaced granular pavement using design charts. You need to draw final design drawings (not to scale is acceptable but indicate all required dimensions and units of measurements). You must discuss/interpret everything you calculate (5 marks)

The marking matrix shall be based on the content consisting of the following principles. Each sequential step shall be allocated marks proportionately

1. Accuracy of Input parameter for each computation step with appropriate unit. Marks will only be awarded for correct input
2. Application of accurate methodology with appropriate referencing. Full mark will only be awarded for error free computational steps with appropriate explanation to be understood by an independent person.
3. Accuracy of answer with appropriate unit. Zero mark will be awarded with error in either Input or methodology.
4. If answers to any preceding steps are inaccurate. Partial mark be awarded for subsequent answers.

Additional information should be obtained from the Moodle Unit web-page