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PLANNING APPLICATIONS 2007. Custom Applications for Calculating Transit Operating Statistics from Travel Demand Forecasting Output:. The Denver RTD OpStats 2.0 Transit Operating Statistics Model. May 9, 2007. Herbert Higginbotham Connetics Transportation Group. Background. - PowerPoint PPT Presentation
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Custom Applications for Calculating Transit Operating Statistics from Travel Demand Forecasting Output:
May 9, 2007
The Denver RTD OpStats 2.0Transit Operating Statistics Model
Herbert HigginbothamConnetics Transportation Group
PLANNING APPLICATIONS 2007
TRB Planning Applications 2007
Background• Pre-2001: RTD’s operating statistics for long-
range planning are calculated by manually entering route-by-route data into a spreadsheet
• 2001: First OpStats model produces bus statistics from MinUTP travel demand model output
• 2004: RTD initiates the FasTracks program, amplifying the need to quickly produce bus and rail statistics for alternatives analysis
• 2006: Model is redesigned as RTD OpStats 2.0; updated to read TransCAD travel demand model output and adding a rail statistics module
Route Headways,
Times & Distances
TRB Planning Applications 2007
Typical Alternatives Analysis
TravelDemandModel
Capital andO&M Cost
Models
Systemwide Vehicles,
Hours, and Miles
Period Lengths, Recovery Factors, Annualization Factors, etc.
Operating Assumptions
Manually–Generated
Spreadsheet
Computations
Automation Gap
• Replicating calibrated calculations for several alternatives can take hours and days
TRB Planning Applications 2007
The Automation Gap• Repeatable tasks like data preparation and
summation occupy precious time and introduce human error
• Statistics formulas tend to embed assumptions, leaving them less likely to be consistent or updated across routes or alternatives
• Results must be calculated by an experienced user every time, making tasks difficult to share or transfer
• Calibrating or testing various operating parameters is slow and cumbersome
Manually–Generated
Spreadsheet
Computations
Automation Gap
Route Headways,
Times & Distances
TRB Planning Applications 2007
Analysis with an Automated Model
TravelDemandModel
Capital andO&M Cost
Models
Systemwide Vehicles,
Hours, and Miles
Period Lengths, Recovery Factors, Annualization Factors, etc.
Operating Assumptions
• Accurate operating statistics produced in seconds allow planners more time for data analysis
No Automation Gap
OperatingStatistics
Model
Benefits of the OpStats 2.0 Model
TRB Planning Applications 2007
• Speed– Manual Run: 1-2 hours or longer– OpStats 2.0 Run: 5-8 seconds
• Accuracy– Computations are built-in – no errors from
miscopied formulas or unreferenced worksheets– Facilitates fast and accurate model calibration
across multiple modes and vehicle types
• User-Friendly– Familiar Excel interface and easy-to-use controls
allow even novice users to get results quickly
TRB Planning Applications 2007
Benefits of the OpStats 2.0 Model
• Functionality– Quickly vary systemwide operating assumptions– Produces operating statistics with and without
passenger demand equilibration– Stores countless alternative runs and reruns –
simplifies comparison between multiple scenarios
• Adaptability– Small file sizes allow sharing among many users– Open architecture allows advanced users to
modify formulas and structures to meet shifting agency needs
TRB Planning Applications 2007
Opening the Model
Application loads in standard Excel
window
Adds button to run model to the standard toolbar
Opens to main Model Assumptions page
TRB Planning Applications 2007
Model Input AssumptionsAssumptions are stratified
by service type (local bus, express bus, light rail, etc) and vehicle
type (40’ bus, articulated bus, LRV, etc)
Assigns service hours for peak, offpeak, & early/late periods, and factors for recovery and deadhead
time
Annualization factors by service type
Additional tables allow user to set dwell times, peak hour factors, seats per vehicle, vehicle loading standards, rail
consist max/min, and headway adjustment rules for equilibration
Equilibration switch
TRB Planning Applications 2007
Running the Model
The user is prompted to enter a project name for the new
run
Pressing the Run OpStats button
initiates a new model run
A dialog box allows the user to select the travel demand model (TDM) output file that contains
the route data for the run
The TDM output file is created during a post-assignment process in
TransCAD. This DBF file contains the ID, mode, service type, vehicle type,
headways, run times & distances, and passenger volumes for each
route
TRB Planning Applications 2007
Running the Model
In less than 10 seconds, the run is completed and the user is prompted to save the results
file
TRB Planning Applications 2007
Model Results: Summaries
The user can continue to adjust assumptions and toggle equilibration in the output file to observe the effects of different
parameters
Other worksheets summarize bus
data by time period
Daily and annual bus and rail statistics are reported by service
type and vehicle type in print-ready tables
Some rows have been hidden to show the most pertinent data
TRB Planning Applications 2007
Model Results: Bus Routes
Some columns have been hidden to show the most pertinent data
Separate worksheets perform bus calculations for each time period
Built-in custom formulas calculate bus statistics by
route
With bus equilibration on, peak hour volumes are used to equilibrate headways according to
user-defined rules. In certain cases, the vehicle type will be upsized to accommodate
large loads
Data are imported by route and period from the TDM output
file
TRB Planning Applications 2007
Model Results: Rail Routes
Built-in custom formulas calculate
train and car statistics by route
Data are imported by route from the TDM output file
With rail equilibration on, peak hour volumes are used to calculate rail cars according to user-defined
rules
Some columns have been hidden to show the most pertinent data
TRB Planning Applications 2007
Model Run History
Records key summary statistics for each run to
facilitate alternative comparison
Assigns Run ID and stores run date & time, TDM output filename, and model output
filename so runs can be quickly identified or
recreated
TRB Planning Applications 2007
Model Calibration
General procedure:1. Operating assumptions replicating base year conditions are
input into the model2. OpStats 2.0 is executed with travel demand model output
from the base year validation run3. Results are compared to actual service data for the base
year, adjusting period lengths and run time factors as needed
Denver RTD Calibration• Results from a base year 2005 travel demand model run were
processed in OpStats 2.0 and compared to 2005 actual data• Model-generated bus statistics were within 5% of actual
statistics and model-generated rail statistics were within 5% to 10% of actual statistics
TRB Planning Applications 2007
Potential Applications• FTA New and Small Starts Process
– Requires detailed and accurate operating statistics and associated cost data
• Alternatives Analysis, MIS, EIS– Run and compare multiple scenarios quickly
• SRTP, LRTP, Operational or Financial Analyses– Generates the statistics needed to quickly cost out
constrained and unconstrained plans
• Transit Agency “What If” Scenario Analysis – Test the effects of potential service changes (e.g.,
increasing service spans, changing load standards, etc)
TRB Planning Applications 2007
Potential Add-in Features• Stored assumptions sets
– Allows user to run with one of several pre- and user-defined operating parameter sets stored in the model
• Multi-operator data sets– Useful for regional or large urban studies that cover
multiple agencies and/or operating environments
• Alternatives comparison module– Allows user to select one model run as a baseline and
several others to compare to it
• Cost model integration– Model can be programmed to directly export data to a
separate cost model, or can be designed as part of an all-inclusive operating statistics and cost model
TRB Planning Applications 2007
Model Specifications• Platform: MS Excel 2000
– Is also compatible with Excel 98 and Excel 2003
• Language: MS Visual Basic 6.3– Underlying programming language of MS Excel
• System Requirements:– Windows 98, 2000, ME, XP– Minimum 500 MHz processor speed– Minimum 250 MB RAM
• File Sizes:– Program file: 687 KB– Output files: 1.6 MB
TRB Planning Applications 2007
AcknowledgementsThe Denver RTD OpStats 2.0 model was developed by Connetics Transportation Group in cooperation with:
•The Denver Regional Transportation District (project conception, funding, review, and management)
– Bill Van Meter– Dave Hollis– Lee Cryer– David Krutsinger
•AECOM (TransCAD code-writing)
– Manish Jain
Our deepest thanks for their guidance and support