Innovative Intersections
Prepared for: ITE ANZ
Thursday, 5 November 2015
Presentation by Andrew O’Brien
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
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ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Diverging Diamond
Interchanges
2
Background
Hoddle St/Eastern Freeway
Southern Motorway/Ellerslie-Panmure Hwy, Auckland
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
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TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING 3
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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‘Diverging-Diamond’ Interchanges
4
MnDOT is constructing Diverging Diamond Interchanges
throughout the state. These interchanges:
• Cut overall traffic delays up to 60 percent
• Improve safety by eliminating standard intersection
geometrics and conflict points
• Provide better traffic operations and show some
excess capacity 20 years into the future
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
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Hoddle Street ‘Diverging-Diamond’ Option
6
Response to other’s pessimism:
• I have designed several DDIs
• Just returned from conference in USA and held
discussions with TE’s involved with DDIs
• Limited research shows safety improvements
• Design guides are just that – and are untested
• No histories of head-on crashes
• Main concern is left turn slip lanes from off-ramps
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Hoddle Street ‘Diverging-Diamond’ Option
7
Basic option
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Hoddle Street ‘Diverging-Diamond’ Option
8
Basic option – saves $25-40 m, no acquisition
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
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Southern Motorway/ Ellerslie-Panmure Highway
The issues:
• Long queues blocking the roundabout (rotary)
due to motorway congestion.
• Looked at a range of options to get non-
motorway traffic across the motorway
• Daniel Dryland of Resolve Group suggested a DDI
• DDI offered a way of keeping one lane free of
queues on approaches and in the roundabout
• OBT carried out various analyses and micro-
simulation that demonstrated considerable
benefits
9
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Southern Motorway/ Ellerslie-Panmure Highway
10
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
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Southern Motorway/ Ellerslie-Panmure Highway
11
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
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Southern Motorway/ Ellerslie-Panmure Highway
12
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
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Southern Motorway/ Ellerslie-Panmure Highway
13
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
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Southern Motorway/ Ellerslie-Panmure Highway
14
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
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Interesting Intersections
15
MacRobertsons Bridge – signalised, semi-turbo
Turbo-roundabout WA
Beach Road, Black Rock roundabout
The ‘MUT’ – PHE/Clayton
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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‘MacRobertsons Bridge northern roundabout
16
The issues:
• Long queues on most approaches
• Southern roundabout has DoS of about 0.7
• Delays of up to 20 minutes to get into the
southern roundabout from east, south, or west in
the AM peak
• Cyclist ‘blackspot’
The concept:
• Separate lanes on some approaches
• Meter entries
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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‘MacRobertsons Bridge northern roundabout
17
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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‘MacRobertsons Bridge northern roundabout
18
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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‘Turbo-Roundabouts’
19
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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‘Turbo-Roundabouts’
20
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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‘Turbo-Roundabouts’
21
The concept:
• Separate
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
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Mandurah roundabout – Freeway terminal
22
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
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Place ‘hook turn’ box here
The ‘hook turn’ box
provides for a cyclist
making a right turn from
the west to wait before
crossing the eastern exit to
head south. (This is what
many cyclists do at signals
– (see Austroads). In
effect, the cyclist crosses
the northern entry to the
northern bike lane entry,
then re-enters the
roundabout as if the cyclist
had arrived from the north.
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
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Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Beach Road roundabouts
26
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
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ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
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ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
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Intersections with Trams
31
Mt Alexander Road/Ormond Road
Toorak Road Tram Terminus
Toorak Village
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
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Mt Alexander Rd/Ormond Rd intersection
32
Observations 14 March:
• AM peak
– queues back about 200 m on northern approach
– Most others OK
• PM peak
– Generally congested – queues to east as far back as
freeway
– Queuing back from Moonee Ponds junction
– Queues to south at times to Fenton Street
– Heavy right turn south to east
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
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Mt Alexander Rd/Ormond Rd intersection
33
SIDRA analysis:
PM Peak Scenario SIDRA DoS Adjusted Dos
Existing conditions 0.94 0.98
+ right turn lane from south 0.69 0.65
+ right turn from south + 400 vph (S) 0.70 0.73
+ right turn from south + 400 vph (E) 0.76 0.80
+ right turn from south + 1100 vph (E) 1.04 1.09
+ right turn from south + 700 vph (s) 0.74 0.77
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
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Mt Alexander Rd/Ormond Rd intersection
34
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
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Toorak Village – moveable bicycle lanes
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
Toorak Village – moveable bicycle lanes
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
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Lane lights
37
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
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Toorak Village – moveable bicycle lanes
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
Toorak Road Tram Terminus
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
Toorak Road Tram Terminus
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
Toorak Road Tram Terminus
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
Toorak Road Tram Terminus
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
Toorak Road Tram Terminus
Suite 2, 22 Gillman StreetHawthorn East , Victoria 3123
T: (61 3) 9811 3111F: (61 3) 9811 3131
W: obrientraff ic.com
ANDREW O’BRIEN & ASSOCIATES PTY LTD ABN: 55 007 006 037
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING
TRAFFIC ENGINEERING TRAFFIC PLANNING ROAD SAFETY TRAFFIC IMPACT ASSESSMENTS TRANSPORT PLANNING 44
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