Semi-Automated Approach to Develop Focus Area Forecasts from a Statewide Model 12th TRB National Transportation Planning Applications Conference May 17-21, 2009, Houston, Texas Session 12: Affairs of Statewide Models Ramakrishna Yennamani | PB | | Sam Granato | ODOT | | Greg Giaimo | ODOT | Greg Erhardt | PB | Agenda Overview Motivation Application Focusing model Summary Overview Statewide Model: Study the macroscopic movement Cover Large Areas Subarea Model: Study detailed traffic movements Focus on a small region Statewide Model Subarea Model-1 Focusing Model Subarea Model-2 Subarea Model-n Motivation Why focusing model? 1. Subarea networks are manually developed 2. Trip tables are manually developed 3. Deal with external zones Such efforts are usually isolated Subarea studies frequently conducted by MPOs Significant part of such studies involves developing networks Motivation Provide a framework for a semi automated approach: To develop a subarea network using the statewide model Derive the detailed networks and forecasts effortlessly: Subarea analysis Corridor studies Reduced burden on MPOs Skip network development Skip trip tables development Eliminate external zones Consistent format (Network & Trip Tables): Across all MPOs Across multiple studies within an MPO Application Who might be interested in such a tool? What elements are required to use this tool? Advantages? Control Quality Speed The Ohio Focusing Model Statewide Model Network Statewide Model Trip Tables & Zonal Data 1. Scenario Network Master Network Or Hybrid Network Detailed Network 3. Scenario Trip Tables User Input Study Area (Zones) Buffer Area (Zones) 2. Scenario Junction File 4. Assignment Junction Based Inside Study Area Equilibrium Assignment Elsewhere 4. Assignment Junction Based Inside Study Area Equilibrium Assignment Elsewhere Master Network Statewide Network + Detailed Network Statewide Network: oStatewide highway links oStatewide centroids and connectors Detailed Network: oDetailed highway links oDetailed centroids and connectors Attributes used to identify the above set of links Statewide Zone containing the link Functional Class Statewide Model Network Master Network Or Hybrid Network Detailed Network User Input Focus Area Defined by Statewide Zone Numbers Focus Zones:1270, , ,3390; Buffer Area Why Buffer Area? Connect the detailed links in focus area with Statewide Links Part of junctions at the boundary of the focus area Defined by Statewide Zone Numbers Buffer Zones: 169,191,193,327,329,330; User Input Study Area (Zones) Buffer Area (Zones) Scenario Network Develop network suitable for focus area : Inside the focus area: State wide centroid connector gets deleted Outside the focus area: Detailed network centroid connector gets deleted Detailed highway links get deleted Link outside the study-period get deleted Unconnected nodes and links get deleted 1. Scenario Network Master Network Or Hybrid Network User Input Study Area (Zones) Buffer Area (Zones) Scenario Junction File Used for modeling intersection delay in focus area Contains intersection data for nodes in focus area Created in two stages: 1. Create junction data for all nodes 2. Select only nodes inside focus area Computationally expensive 1. Scenario Network User Input Study Area (Zones) Buffer Area (Zones) 2. Scenario Junction File Scenario Trip Tables Develop trip tables: To match focusing model zoning system Disaggregate by: Time period (AM, MD, EV, PM) Vehicle class (CAR, TRUCK) Disaggregate using socio economic variable: F(pop, emp) Changes the zone system: Compress the zone system Update network consistent with trip tables Statewide Model Trip Tables & Zonal Data 3. Scenario Trip Tables User Input Study Area (Zones) Buffer Area (Zones) S1S2S3 d11d12d13d14d15d16d17 S1 d14 S3 d16 S1S3 d14d15 Trip Table Estimation Option available to estimate better trip tables using: Scenario trip table Traffic count data Screen line counts User provided confidence levels Cube analyst required! Assignment Uses: Disaggregated trip tables Modified network Junction assignment inside focus area UE assignment outside focus area Runs either 2 class assignment (CAR & TRUCK) or 12 toll class assignment (CAR 1-3 & TRUCK 1-9) 1. Scenario Network 3. Scenario Trip Tables 2. Scenario Junction File 4. Assignment Junction Based Inside Study Area Equilibrium Assignment Elsewhere 4. Assignment Junction Based Inside Study Area Equilibrium Assignment Elsewhere Conclusions Extension to statewide models Derive the detailed networks and forecasts effortlessly Consistent format across several studies Junction assignment inside focus area UE assignment outside focus area Focusing Model Team Yennamani Ramakrishna: Greg Giaimo: Sam Granato: Greg Erhardt: Patrick Costinett: