preliminary tests of a dynamic user equilibrium model
Post on 15-Jan-2022
2 Views
Preview:
TRANSCRIPT
16th TRB Planning Applications Conference
Preliminary Tests of a Dynamic User Equilibrium Model in the Pikes Peak Region
Mary R. LupaSenior Supervising Planner
Path to Enlightenment: Session M7May 16, 2017
16th TRB Planning Applications Conference
• Investigate a readily available Dynamic User Equilibrium module available from the software supporting the existing 4-step model
• Conduct simple planning level tests to understand the outputs available from the DUE module
• Persuade MPO decision makers to invest in dynamic traffic software and research
2
Goal of the DUE Tests at PPACG
16th TRB Planning Applications Conference
• Colorado Springs / 2-county region
• 2015 population of 320,000
• Large active military population
• 786 TAZ
3
Pikes Peak Area Council of Governments (PPACG) Region
16th TRB Planning Applications Conference
PPACG DUE Approach• Used a PTV product – VISUM Dynamic User
Equilibrium – runs in version 15 and up• An am peak period trip table was extracted from
the 4-step model• 7:00 am to 10:20 am captured in 10 minute intervals• Traffic flows, queuing and speeds are output• Network tasks – reviewed centroid connectors, adapt
outflow values from a similar application
• 6 hour run time on a dual core Intel(R) Xeon(R) CPUX5647 @ 2.93GHz
4
16th TRB Planning Applications Conference
Outline of DUE Tests• Three investigations
• Test A: Regional overview of “hot spots” in the am peak
• Test B: Examine link outflow as a surrogate for signal or intersection improvement in a corridor
• Test C: Land use sensitivity tests (Fort Carson / BRAC)
5
16th TRB Planning Applications Conference
Test A: Regional overview of “hot spots”
Capture the entire MPO region in a three hour am peak period by ten minute intervals to verify hot spots. Congested intervals 7:10 to 8:20 am selected.
Capture the entire MPO region in a three hour am peak period by ten minute intervals to verify hot spots. Congested intervals 7:10 to 8:20 am selected.
16th TRB Planning Applications Conference
070000
16th TRB Planning Applications Conference
071000
16th TRB Planning Applications Conference
072000
16th TRB Planning Applications Conference
073000
16th TRB Planning Applications Conference
074000
16th TRB Planning Applications Conference
075000
16th TRB Planning Applications Conference
080000
16th TRB Planning Applications Conference
081000
16th TRB Planning Applications Conference
082000
16th TRB Planning Applications Conference
Test A average am speeds (all non-centroid links)
16th TRB Planning Applications Conference
Test A queues (all non-centroid links)
16th TRB Planning Applications Conference
Summary of Test A• While ten-minute queue and average speed are
new and uncalibrated reporting metrics, they offer PPACG a “way forward”
• Refined time slices (am or other periods) can pinpoint the location and time of congestion
• Consistency of mesoscopic and 4-step V/C reports from the AM peak are looked for and expected
• Visuals engage the public and offer more lifelike captures of congestion
16th TRB Planning Applications Conference
Test B: Link Outflow sensitivity test
Test of link “outflow” – the carrying capacity of the existing link flow – at a given node. Can replicates signal enhancement
Test of link “outflow” – the carrying capacity of the existing link flow – at a given node. Can replicates signal enhancement
16th TRB Planning Applications Conference
Link Location Academy Boulevard near Fort Carson Gate
Fort Carson (US Army)
Study Location
16th TRB Planning Applications Conference
Outflow sensitivity testBase AM Peak DUE Application
2010
Test B1Policy - Signal Priority
Enhancement on congested Expressway near Fort Carson
No Network Changes
Outflow
Before After
0.6754 0.8500
Test B2Policy - Signal Priority
Enhancement on congested Expressway near Fort Carson
No Network Changes
Outflow
Before After
0.6754 0.9500
16th TRB Planning Applications Conference
Speed
16th TRB Planning Applications Conference
Queue
16th TRB Planning Applications Conference
Test C: Land use sensitivity tests
Test land use – increasing or decreasing the flow of traffic to a zone or zones. Replicates land use changes such as a new shopping center, BRAC realignment, or new/enhanced tourist attraction.
Test land use – increasing or decreasing the flow of traffic to a zone or zones. Replicates land use changes such as a new shopping center, BRAC realignment, or new/enhanced tourist attraction.
16th TRB Planning Applications Conference
Land use sensitivity testBase AM Peak DUE Application
2010
Test C1
Policy - BRAC Increases Workers/travelers into and Out of Fort Carson by 1.5 in
the AM Peak
No Network Changes
Outflow
Before After
No changes
No changes
Test C2
Policy - BRAC Increases Workers/travelers into and Out of Fort Carson by 2 in
the AM Peak
No Network Changes
Outflow
Before After
No changes
No changes
16th TRB Planning Applications Conference
Speed
16th TRB Planning Applications Conference
Queue
16th TRB Planning Applications Conference
Diverted trafficTest C1
Test C2
16th TRB Planning Applications Conference
Next Tasks• Complete 2015 4-step model and DUE extension• Integrate node delay within 4-step with DUE link
outflow values• Begin collection of and comparison to observed
data• Work with the MPO to educate decision makers
and citizens on the value of dynamic traffic tools
16th TRB Planning Applications Conference
In conclusion• DUE is a powerful mesoscopic tool available as an
extension of existing software used by the PPACG• Mesoscopic tools are a bridge towards more
detailed DTA models• First cut am peak investigations in Colorado Springs
are promising
16th TRB Planning Applications Conference
Contacts
Mary LupaWSP USAmary.lupa@wsp.com
Maureen Paz de AraujoWilson & Companymaureen.pazdearaujo@wilsonco.com
Chetan JoshiPTV AmericaChetan.joshi@ptvgroup.com
Ken PratherPPACGkprather@ppacg.org
31
top related