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SmartBRT: A Bus Rapid Transit Modeling and Evaluation Tool

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Input can come from CAD drawings, manual observation, maps, etc. ... Flows into corridor from side streets, main street. Signal phasing ... – PowerPoint PPT presentation

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Title: SmartBRT: A Bus Rapid Transit Modeling and Evaluation Tool


1
SmartBRTA Bus Rapid TransitModeling and
Evaluation Tool
  • The SmartBRT Team
  • California PATH, UC Berkeley
  • Contact Joel VanderWerf
  • vjoel_at_path.berkeley.edu, 510-231-9446

2
What is SmartBRT?
  • Simulation and visualization software
  • Developed specifically for Bus Rapid Transit
    (BRT)
  • Captures transportation system, BRT
    infrastructure, and BRT operation concepts
  • Also studies traditional (non-BRT) transit.

3
Why Do We Need SmartBRT?
  • Aids in understanding interactions and tradeoffs
  • within the rapid transit system
  • between the rapid transit system and the rest of
    the transportation system
  • Quickly performs what if studies
  • Without expense of field operational tests
  • Simulates and visualizes
  • Effects of implementing intelligent
    transportation system (ITS) technologies in rapid
    transit operation
  • Minimizes the need for expensive field tests

4
What does SmartBRT do?
  • SmartBRT is developed to aid in
  • Planning new BRT systems
  • Evaluating new and existing BRT infrastructure
    and operation concepts
  • Planning and evaluating BRT deployment stages
  • Communicating the above through visualization

5
Who will be SmartBRTs Users?
  • SmartBRT has a wide spectrum of users
  • Transit operators
  • Need to study high-level concepts
  • Do not need detailed description of roadway
    geometrics and parameters
  • Transit planners and engineers
  • Need to study very detailed concepts
  • Need very detailed description of roadway
    geometrics and parameters

6
Applications of SmartBRT, 1
  • What if studies
  • What if we
  • implement Signal priority?
  • implement dedicated lanes?
  • use buses with more doors?
  • Compare fare collection methods
  • What effects reliability the most?
  • What effects travel time the most?

7
Applications of SmartBRT, 2
  • Trade-off analysis
  • Effect of articulated buses at lower frequency on
    overcrowding
  • Effect of signal priority on cross traffic delay
  • Cost-effectiveness analysis
  • Small buses at high frequency VS. articulated
    buses at lower frequency
  • Threshold analysis
  • When to switch from mixed traffic to dedicated
    lane
  • ITS technology evaluation
  • Effect of precision docking on travel time

8
Using SmartBRT
  • Analysis
  • Travel time
  • Dwell time
  • etc.
  • INPUT
  • Geometrics
  • Traffic
  • Signal
  • Transit
  • OUTPUT
  • Log files
  • Statistics

Run Simulation
Animation
9
Geometry InputShorthand Geometry Format
  • Input can come from CAD drawings, manual
    observation, maps, etc.
  • Shorthand format encodes lengths, curvature, lane
    configuration, junction shape, signal, bus stops,
    medians,
  • Compact and easy to type or write longhand

10
CAD Drawings ? Shorthand
- 3w 3e m 220 80 Brockton Ave. sw signal 1s20
1n20 - 3w 3e wltl 90
11
Traffic Input
  • Data required
  • Turning ratios at junctions
  • Flows into corridor from side streets, main
    street
  • Signal phasing
  • Can be entered in tabular form, or
  • Can be converted automatically from output of an
    analysis program, such as Traffix

12
BRTML
  • Bus Rapid Transit Modeling Language
  • Unified data language/database for BRT project
  • Geometry and traffic data
  • Automatically read from Shorthand and from
    Traffix (http//www.traffixonline.com) output
    files, or
  • BRT planner can manually edit
  • Transit data added by planner (see next slide)

13
BRTML Adding Transit Data, 1
  • Terminals
  • Location, route, bus count
  • Headway and headway hold policy
  • Stops
  • Passenger arrival rate, transfer stops
  • Enclosed or not, number of bus docks
  • Signals
  • Green hold time for signal priority

14
BRTML Adding Transit Data, 2
  • Bus lane usage policy, overtaking policy
  • Bus
  • Door count, board/alight policy
  • Payment methods
  • Base dwell time, maximum speed
  • Passengers
  • Payment types and mobility types
  • Affect board/alight time
  • Distributions of these types in population

15
BRTML Simulation Plan
  • Duration, start time, time step
  • Statistics to be collected
  • Options to output detailed data
  • Passengers
  • Vehicle trajectories
  • Debugging and tracing options

16
Run Simulation
  • SmartBRT combines
  • Ambient traffic model of Paramics
  • Paramics is a high-performance commercial traffic
    microsimulation
  • http//www.paramics-online.com
  • Custom transit model (as a plug-in)
  • Buses, stops, passengers, signals, and terminals

17
Collect Output Data
  • Statistics files
  • Many performance measures (next slide)
  • Per passenger data
  • Origin and destination
  • Time spent waiting, sitting, and standing
  • Trajectory data for animation
  • Vehicle position at each time step
  • Signal state at each time step

18
Performance Measures
  • Variables include
  • Bus headways, travel times/speeds
  • Board/alight times, dwell times
  • Priority time given
  • Passenger seated time, travel speed
  • Measured per stop, per signal, per route, etc.
  • Choice of min, max, mean, variance, or all values
  • Options per statistic include
  • Delay, calculation window, reporting period

19
Visualization
  • Runs off-line from simulation
  • Uses outputs from SmartBRT simulation
  • Uses road geometry defined in BRTML document
  • Can customize for specific site
  • Can insert buildings photographic textures
  • Can insert trees, signs, etc.

20
Animation
SmartBRT
21
Future Work
  • Add functionality
  • Benefit/Cost analysis
  • On-line 3D visualization within Paramics
  • Connect to transit scheduling software
  • Feeder network studies
  • Linking BRT with scheduled service
  • Tutorial
  • Introduce potential users to BRT and to the use
    of SmartBRT

22
Acknowledgement
  • Two-year project, started in June 2000
  • Funded by
  • Caltrans simulation tool development for Bus
    Rapid Transit (BRT) and case site studies
  • FTA visual simulation (year 1)
  • Data supplied by the Los Angeles Metropolitan
    Transportation Authority
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