Implementation of a headway control system for buses in santiago
Transcript of Implementation of a headway control system for buses in santiago
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Implementation of a Headway
Constrol System for Buses in Santiago
Ricardo Giesen
Juan Carlos Muñoz, Felipe Delgado & Pedro Lizana
Pontificia Universidad Católica de Chile
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Bus Bunching
• Santiago, Chile
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Bus Bunching
• Bogotá, Colombia
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Bus Bunching
• Beijing, China
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Bus Bunching
• Brussels, Belgium
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Bus Bunching
• Boston, MA
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• London, UK
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Bus Bunching
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Bus Bunching
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Bus Bunching
• Trajectories: distance vs time
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NN
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Bus bunching is a challenging problem
Increases average waiting times
Pushes transit agencies to increase the number of buses
Reduces transit comfort and reliability
Solution: Control headways
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Schedule-based control
• Common in USA and Europe
• Low frequency services
• Not appropiate for Transantiago
High frequency
Congestion
Long services (60+ km) with more than 120 stops
Buses overtake each other
• Schedule adherance is extremely difficult
Requires a lot of effort by the people involved in operating the system
Not flexible: partially considers real-time information
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¿In Transantiago?
Fine system => Multas: ICF e ICR
Guarantee frequence and regularity compliance
Fines whenever heaways exceed a threshold
Have put into evidence the lack of solutions cost-
effective solutions available in the market
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Proposed headway control model
• Rolling horizon mathematical programming optimization
model (Delgado et al., 2012)
• Minimize user waiting times subject to system constraints
• Seeks to regularize operation and address bus bunching
with real-time information
• Decision variable: holding times at bus stops, increase or
decrease bus speed
• Buses do not follow a schedule: supply is adjusted to
demand depending on real-time system conditions (traffic
and bus headways and capacities)
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Simulation results
• Both in BRT corridors and mixed-traffic services the
following benefits have been observed:
Reduced waiting times and their variability
More regular headways: decreased regularity fines
More even bus loads: improved bus confort
Improved cycle time regularity making terminal
operations smoother
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Simulation results: video
No control
With control
Circle: buses
Color: bus loads
(green: empty….red: at capacity)
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Headway control software: Buzz Assist
• Develop software and implement solution in real bus
services
• Retrieve real-time bus location and run optimization
model with a frequency of one minute
• Control instructions are then sent to any Android
(commercial or industrial) tablets (with GPS and data
plan) installed in the buses
• Software is flexible enough to adapt to existing transit
system technology (GPS devices and consoles)
• Operates in headway and schedule based control
systems
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Software: Input information
• Static transit system data:
• Bus services, operating programs, bus stop locations, etc: data in General Transit Feed Specification (GTFS) format (used by Google Transit)
• Real-time bus positions:
• GPS devices already installed in buses
• Tablet GPS
• Demand data: • Passive smart card information: OD matrices and historical bus stop
arrival rates
• Segment speeds:
• Combination of real-time speeds with historical speeds
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Synoptic & dashboard web tool
• Visualize buses and control instructions, modify system
parameters and download daily operating reports
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Buzz Console
• “Slow down” recommendation
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Buzz Console
• Wait additional time at bus stops and headers
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Buzz Console
• Ok
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Buzz Console
• Speed up if possible
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Buzz Console
• Traffic congestion
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Console device management system • Check device statuses
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Buzz Console • Currently testing in real operating conditions different devices:
commercial tablet vs. industrial console
• Start pilot test in B22 and B14 services (February 2015)
• Obstacles: anti-theft and ruggedized support structures
• Lessons: offer an integrated service (both hardware + software)
and relevance of headway control in terminals
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Integration to existing technological system
• We have successfully integrated our technology to an
existing fleet management system (with Subus Chile S.A)
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Holding
Instruction
Copyright: Mobius S.A.
Time with
forward and
backward
buses
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Integration to existing technological system
• Pilot test in 210 service since March 2014
• Results: 40-50% decrease in fines despite a 25%
compliance rate
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System not operating
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Complementary technologies
• Android Mobile App for dispatching buses in terminals
• Android Mobile App for counting passengers in buses
• Buzz Santiago: sustainable mobility App (transit+bike)
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Thank you
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Implementation of a Headway
Constrol System for Buses in Santiago
Ricardo Giesen
Juan Carlos Muñoz, Felipe Delgado & Pedro Lizana
Pontificia Universidad Católica de Chile