Modeling HOV lane choice behavior for microscopic simulation models and its application to evaluation of HOV lane operation strategies - PowerPoint PPT Presentation

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Modeling HOV lane choice behavior for microscopic simulation models and its application to evaluation of HOV lane operation strategies

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Title: Modeling HOV lane choice behavior for microscopic simulation models and its application to evaluation of HOV lane operation strategies


1
Modeling HOV lane choice behavior for microscopic
simulation models and its application to
evaluation of HOV lane operation strategies
  • Jun-Seok Oh
  • Western Michigan University
  • Lianyu Chu
  • University of California, Irvine

2
Investigation of HOV Modeling Capability in
Microscopic simulation Models
  • Jun-Seok Oh
  • Western Michigan University
  • Lianyu Chu
  • University of California, Irvine

3
Content
  • Motivation and Objectives
  • Classification and Operation of HOV System
  • Analytical Model for HOV Lane Traffic Estimation
  • HOV Modeling in Microsimulation Models
  • Experiment and Performance Comparison
  • New Modeling Approach
  • Concluding Remarks

4
Motivation
  • FHWA encourages the installation of HOV lanes as
    an important part of an area-wide approach
  • There are still questions on
  • the effectiveness of HOV systems
  • their impacts on air quality
  • The benefits of HOV systems have not been well
    quantified
  • Microsimulation might be a good way, but still
    involves some limitations

5
Objectives
  • Compare HOV modeling capability and performance
    in
  • Paramics
  • AIMSUN
  • Identify limitations and investigate methods to
    enhance HOV behavior modeling in microsimulation
  • Develop an improved HOV simulation analysis tool
    using API capability

6
Classification of HOV System
Infrastructure Mainline HOV lane Freeway-to-freeway direct connectors Direct local access ramps Freeway ramp meter bypass lanes Toll plaza bypass lanes
Designed Access Open system Closed system (Limits access with barrier)
Use Restriction 2 people minimum occupancy 3 people minimum occupancy Buses Vehicles paying toll (High Occupancy Toll)
Operational Period Full time operation Part time operation
7
HOV Operations
8
Analytical Model for HOV Lane Traffic Estimation
  • User Equilibrium between HOV/GP
  • HOV lane is faster than GP lanes
  • tHL tGL
  • fHOV(VHOV - VHG) fGP(VSOV VHG)
  • If fHOV(VHOV) fGP(VSOV), VHG 0
  • If fHOV(VHOV) gt fGP(VSOV), VHG gt 0
  • VHG can be found by solving
  • fHOV(VHOV - VHG) fGP(VSOV VHG)

9
HOV Modeling in Microsimulation Models
  • Vehicle Types
  • SOV HOV
  • Defining HOV Lane (Open HOV System)
  • Allow HOV only on HOV lane
  • Lane barrier (Closed HOV System)
  • Closed HOV available in AIMSUN
  • Closed HOV via plug-in in Paramics

10
HOV Behavior Modeling
  • Optional
  • By allowing HOV only on HOV lane
  • May underestimate HOV on HOV lane
  • Compulsory
  • By forcing all HOV to use HOV lane
  • 100 HOV on HOV lane ? Unrealistic
  • Separate links for HOV lane
  • Route choice with dynamic feedback
  • Not applicable to Open HOV
  • Paramics provides HOV plug-in for more HOVs on
    HOV lanes

11
Experiment Scenarios
  • Scenario 1 Closed HOV
  • Using given capability
  • Scenario 2 Separate Links for Closed HOV
  • Treating closed HOV lanes as separated links
  • Scenario 3 Open HOV
  • No barrier between HOVL GPL
  • Assumption HOV demand - 15 of total traffic
  • MOEs
  • Traffic volume split between HOVL GPL
  • HOV demand split b/w HOVL GPL
  • HOV demand split w.r.t speed of GPL

12
Study Network I-405, Irvine, California
13
Study Network I-405, Irvine, California
HOV open
HOV closed
HOV closed
HOV open
  • Northbound I-405
  • 6 km freeway stretch

14
Scenario 1 Closed HOV
  • Paramics Plug-in provided by vendor
  • add additional layers of detail to the HOV
    modeling
  • influence lane changing behavior and lane
    discipline
  • model both open/closed HOV lanes
  • AIMSUN Default function
  • Restrict lane-changing with solid-line

15
S1 Volume Comparison
  • GP lane volume
  • HOV lane traffic is underestimated
  • Paramics HOV lane traffic constant during
    simulation period

16
S1 HOV traffic
  • of HOV lane traffic
  • of HOVs on HOVL

17
S1 HOVs on HOVL w.r.t GPL Speed
  • Paramics
  • Not sensitive to the traffic condition on GPL
  • AIMSUN
  • Slower speed on GPL leads to more HOVs on HOVL

18
Scenario 2 Separate links for closed HOV lanes
  • Separate links for closed HOV lanes
  • Use route choice model in HOV lane choice
  • Dynamic link costs update
  • HOVs are treated as guided drivers
  • change route (lane) while driving

19
S2 Volume Comparison
  • of HOV lane traffic
  • Close to observed HOVL volume
  • of HOVs on HOVL
  • 70 80 during congested period

20
S2 HOVs on HOVL w.r.t GPL Speed
  • Paramics
  • AIMSUN

21
Scenario 3 Open HOV Lane
  • HOV can access anywhere
  • HOV lanes are restricted only for HOVs
  • Rely only on lane-changing restriction model

Dotted-line all open area
22
S3 Volume Comparison
  • of HOV lane traffic
  • Underestimates HOVL volume
  • of HOVs on HOVL
  • Low HOLV utilization

23
S3 HOVs on HOVL w.r.t GPL Speed
  • Paramics
  • AIMSUN

24
Findings
  • Closed HOV Lanes
  • Underestimates HOVL traffic
  • Paramics 65, AIMSUN 85 of observed
  • Paramics Plug-in need improvement
  • Better when incorporating route choice behavior
    with dynamic cost update
  • Performance varies by route choice model
  • Open HOV Lanes
  • Current HOV modeling NOT satisfactory
  • Paramics 60, AIMSUN 78 of observed
  • Underestimates due to the lack of capability to
    measure lane-by-lane traffic condition

25
Other Scenarios
  • Compulsory HOV Lane
  • AIMSUN has an option for compulsory HOV
  • Almost 100 HOVs use HOVL
  • Not realistic for HOV lane analysis
  • Useful tool for exclusive bus-lane
  • Paramics
  • Can implement by defining HOV only lane and SOV
    only lane
  • But need to define area where both types can use
    for exiting and entering
  • No HOV Lane

26
Overall Travel Time Comparison
  • Limited analyses
  • Compulsory and No HOV lane case outperformed
  • Elasticity of HOV demand NOT considered

27
New HOV Modeling Approach
  • Using API (Applications Programming Interface)
    capability
  • Consider HOV drivers visual perception on
    traffic condition
  • Visual perception-based instant HOV lane choice
    model

28
Concluding Remark
  • Microsimulation needs to be enhanced for HOV
    analysis
  • Closed HOV can be analyzed by incorporating route
    choice model with separate HOV links
  • Open HOV analysis needs enhanced model
  • Need to develop improved HOV behavior model
    considering drivers visual perception on traffic
    condition
  • Need to calibrate model using real-world data
  • HOV demand and elasticity survey
  • Microsimulation has potential for HOV evaluation,
    but only with enhanced behavior model

29
Thank you!
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