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PT Modeling in S'pore [Terence Ng]
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Transcript of PT Modeling in S'pore [Terence Ng]
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Citilabs 2009 Asia-Pacific User ConferencePublic Transport Modeling in Singapore
using TRIPS and CUBETerence Ng
Manager, Service DevelopmentSBS Transit Ltd
Singapore
11 Mar 2009
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Presentation Outline• Some facts on Singapore
• Model Design and Applications
• Limitations and Challenges
• Migration to CUBE and its benefits
• Further development work
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Some facts on Singapore• Land area: 700 km2
• Population: 5 million
• Over 50% use public transport
• Daily Rides: – Bus (3.0 million)– Rail (1.6 million)
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Public Transport in Singapore
• Bus/MRT/LRT are main modes• 2 major multi-modal operators
– SBS Transit– SMRT
SBS TransitBus AreaRail LinesSMRTBus AreaRail Lines
Central Area
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SBS TransitBus• 2,800 buses• 254 routes• 2.3 million rides daily• 16 bus interchanges, 16 terminals• Over 3,000 bus stopsRail• 360,000 rides daily• 15 MRT stations, 19 LRT stations
in operation
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Model Design and Application
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Building up Modelling Expertise• Acquired TRIPS in 2001• Evaluate impact of route
changes• Assess viability of new route
proposals• Test many options before
determining the best proposal• Being self-sufficient in
transport modelling.
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Model Development• Maps from street directories• Link speeds from onboard
bus equipment• Lines information from
public transport guides• Demand matrices from
ticketing data• Development data from
various agencies
[ez-link reader][IDFC console]
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Model Structure
Demand Matrices• Origins and
destinations fromsmart card data
Service Information• Routes, headway, run
times, capacity,• Mode Type, fares,
operator
Assignment• Time Period - AM Peak 0630–0830 hrs
• User Classes- Adult Fares- Child/Student Fares- Student Pass
• Mode characteristics- Boarding Penalties- Transfer Penalties- Walk Factors- Wait Factors- Value of Time
Total Boarding and Passenger KM• By route, direction,
mode and operator
Load Profile• By route and direction at
nodes/stops
Stop-to-stop movements• By route and direction
INPUT OUTPUTPROCESS
Base Map• Nodes (Bus stops,
MRT stations, interchanges, terminals)
• Links between nodes
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Calibration• Total Boarding and
Passenger KM by route and direction
• Total passenger volume leaving towns
• Station-to-Station movements for MRT
• Heaviest load points by route
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Major Applications• Implementation of over 20 new
routes and more than 50 route changes (2001–2008)
• Commencement of North-East MRT Line and Sengkang LRT East Loop (2003)
• Opening of Punggol LRT East Loop and Sengkang LRT West Loop (2005)
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Limitations and Challenges
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Strictly Public Transport• Demand matrices built
directly from smartcard data
• Does not account for effects on private transport modes
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Demand Matrix• Full details within
SBS Transit areas• Aggregated data
between SBS Transit and SMRT areas
• No data within SMRT areas
• SMRT Rail Captive zones need treatment
• Difficult to manipulate in *.mat format
Central Area
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Total Generalised Costs• Usually satisfied at
global level and easy to skim
• Does not sufficiently address the affected minority
• More details needed at precinct and route level
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Limited Output from Reports• Planners need detailed breakdown of
passenger impact in terms of fares, journey times and number of transfers for any service proposal
• Too many skimming process slow down model run times
• Detailed computations still done manually outside of model
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Migration to CUBE and its benefits
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Migration to CUBE• Upgraded to CUBE since Jul 2008• Ease updating of network and matrices• Enhance evaluation of
proposals• Automate generation of
useful planning data• Better interface with own
systems
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Program Control• Script vs Menu based
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Network Map• Use of layers
• Easier to navigate and update interactively
• Wider choice of colour sets
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Inputs in Database Formats• Nodes, links, matrix
records can be maintained in DBF formats easily editable in Excel
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Assignment• Program boxes reduced significantly• Can put more functions in each program group
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Fare Matrices• Use of station-to-station fares • Better represent through-fares between rail lines
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Select Link• Ability to select line, nodes, links or a
combination of criteria
• For example: -MW[1] = SELECTLINK((L=12809-40025* + LINE=2400) & (L=12200-40026* + LINE=2400))
for a new bus service connecting 2 different MRT stations
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Reports• Transfers between
operators, modes
• Stop-to-stop movements
• Path analysis
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Further Development Work
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Further Development Work• Sensitivity tests of assignment parameters
and fare models• Improve quality of reports• Matrix estimation using
screen line flows• Path analysis with
through fares
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QUESTIONS?