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Tips, Trips, and Traps of TransCAD Modeling LSA Associates, Inc. September 2001 North Carolina MPO Conference.

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Presentation on theme: "Tips, Trips, and Traps of TransCAD Modeling LSA Associates, Inc. September 2001 North Carolina MPO Conference."— Presentation transcript:

1 Tips, Trips, and Traps of TransCAD Modeling LSA Associates, Inc. September 2001 North Carolina MPO Conference

2 1 Why Model? Why Jurisdictions Convert to TransCAD? The Transportation Model GIS Developer’s Kit Applications Agenda

3 Why Model? Why do we model the transportation network?

4 3 Why Model? To consider the effects of land use, transportation, and air quality To determine infrastructure needs, costs, and timing as growth occurs To analyze land use and transportation alternatives To provide a consistent platform for travel forecasting Required by the federal government for metropolitan areas

5 4 The History of Travel Forecasting Aggregate Models Few zones Major highway planning only Computers available to large agencies 50’s 80’s 90’s 80’s and 90’s 00’s 60’s 70’s 60’s and 70’s Shift to microcomputers More zones Detailed transit and HOV models Computer chip technology advances Federal government sponsorship Travel behavior surveys widespread Basic transit capability Windows-based More disaggregation and detail GIS-based models Microsimulation

6 Why Jurisdictions Convert to TransCAD? Why are agencies converting their travel models to TransCAD?

7 6 Why Convert? Some widely-used older modeling software are no longer being supported – a new modeling platform is required Limited capabilities in Graphics Memory GIS Network size Number of TAZs

8 7 TransCAD Users There are many states in America that currently use TransCAD

9 8 Geographic Information Systems A GIS-based transportation model Compatible with other GIS tools Spatial Analysis ArcView Shape Files TransCAD *.dbd Files

10 9 Why TransCAD? A powerful modeling software that can enhance the modeling process Windows-based menus that are intuitive to manipulate A GIS software with transportation modeling capabilities No internal size limitations Scenario manager for easy file management Ability to easily analyze intermediate results Mapping and visualization tools designed for GIS and transportation applications TIP: Choose a powerful computer!

11 The Transportation Model What is involved with a travel demand model?

12 11 Modeling Process Trip Generation Trip Distribution Mode Analysis Traffic Assignment Socioeconomic Data Roadway Network Transit Network Transit Ridership Transit Assignment Roadway Volumes Performance Report How many trips? Where will they go? What mode? What route? Identify needs Alternatives analysis

13 12 TransCAD Inputs Easy to understand file structure No restrictions on file names, locations, etc. File names are easy to change in the model structure with the scenario manager, created in GISDK

14 13 TransCAD Outputs Checking intermediate modeling results is easy in TransCAD Identifying results from an individual project area allows detailed study of the project Performance module allows consistent reporting of results

15 14 Data and Databases Geographic data Network data Attribute data TransCAD model data Socioeconomic data US Census data Jurisdictional boundaries Zip codes Railroads Water Features Tiger Streets Files

16 15

17 16

18 17 Networks Networks are GIS databases Conflation to GIS distances and shapes Foundation for traffic counts, performance, transit, and any other data Multi-year network capability TIP: Keep raw count data and adjustments in traffic count database

19 18 Networks GIS Networks Roadway System Transit Routes Air Quality Performance Time of Day Volumes Project Selection (TIP/RTP) Traffic Counts

20 19

21 20

22 21 Traffic Analysis Zone Data Zonal areas used in modeling trips Ability to incorporate census data Used for summaries and reports Used for visually verifying data

23 22 Socioeconomic Data Interface with popular GIS platforms Land use to socioeconomic conversion using TransCAD’s GIS tools Visual representation of land use and socioeconomic data TAZ coverage provides foundation for area-based data and is easily modified TIP: Socioeconomic sub-model can use a Fratar process coded in GISDK

24 23 Socioeconomic Data and TAZ Structure GIS TAZ Structure Area Type 2020 Socioeconomic Data Performance and Air Quality Area based Indexes K Factors Terminal Penalties 1998 Socioeconomic Data

25 24

26 25 Trip Generation Robust cross classification production model Unlimited trip purposes Production allocation and attraction allocation models TIP: Include all modeling steps in TransCAD using GISDK, without compromising model structure. This ensures a full running model from start to finish.

27 26 Trip Generation Incorporate land use data Detailed trip purposes Distance-based allocation models Special generators Universities Hospitals Amusement parks Event centers Malls Government installations

28 27

29 28 Trip Distribution TIP: Geocode survey data in house to determine trip lengths Desire lines between TAZs and districts TRIP: GISDK standard gravity evaluation procedure does not correctly apply K factors in version 3.6 Friction factors – calibrated curves versus lookup table

30 29 Mode Analysis Customized nested logit and multinomial logit models TIP: Don’t be limited to standard TransCAD procedures, create exactly what you want with GISDK Distance-based bike and pedestrian equations

31 30 Nested Logit Structure Person Trips MotorizedNon-Motorized Drive AloneShared RideAuto PassengerTransit DA Non TollDA TollSR2 Non HOVSR2 HOVSR3 Non HOVSR3 HOVAuto ExpressAuto LocalWalk ExpressWalk Local Non HOV Non Toll HOV Non Toll Non HOV Toll HOV Toll Non HOV Non TollNon HOV Toll HOV Non TollHOV Toll ExpressUrban RailCommuter Rail ExpressUrban RailCommuter Rail

32 31 Traffic Assignment Time of day User defined volume-delay equations Speed post-processing Speed feedback AM peak – congested speeds Off peak – freeflow speeds All or nothing, capacity constrained assignments with comparison

33 32 TransCAD Transit Capabilities Walk access vs drive access Unlimited number of modes Unlimited number of variables Stops dependent upon individual routes

34 33 Transit Assignment Transit boardings by stop, by route, or by mode Drive or walk access assignment Transit flows by link Transit line volumes

35 34 Validation Screenlines – GIS line layer created quickly TRIP: One way links confuse the built-in screenline analysis functions

36 35

37 36 Model Conversion Process Existing Model Initial Model Conversion (Caliper or LSA) Network Conflation and Model Replication Model Enhancements Calibration / Validation TRIP: The base converted model is not ready to go! TIP: Develop performance reporting capabilities early. TRIP: TransCAD uses different distances – this may affect model results. TRIP: Need to adjust for software differences. Performance Reporting

38 GIS Developer’s Kit The endless possibilities with the TransCAD programming language

39 38 TransCAD Scripting Capability GISDK is the TransCAD programming language Allows for complete automation of the modeling process unique to each model Eliminates user error by programming all steps and variables in a model run Similar to programming in C++ (with different syntax and commands) Use the programming editor of your choice to create and edit the GISDK script TIP: Boxer Software is a good (and inexpensive) programming editor

40 39 Model User Interface The dialog boxes that run the whole model Reduce errors by eliminating point/click/type commands GISDK is the key to programming the model

41 40 TransCAD Dialog Boxes Custom user interfaces created using GISDK Fully automates the model procedures – including file names, variables, and summary reports TIP: These really help the consistency and accuracy of the model!

42 41 Scenario Manager Created using GISDK Manages all files related to each alternative

43 42 GIS Developer’s Kit (GISDK) Program exactly what we want TransCAD to do Allows for any mathematically sound method or procedure Not confined to standard TransCAD procedures Full dialog box customization

44 Performance Reporting The possibilities available for performance reporting

45 44 Provides consistent and convenient summary reports Created with GISDK Customized to the client’s needs Performance Module Analysis tool for troubleshooting model runs Facilitates calibration and validation TIP: Create EARLY in modeling process!

46 45 Summary Reports The summaries are customized using GISDK and summarize the model data in many ways, including… Facility Type and Area Type Capacity Analysis Congestion Delay Air Quality Emissions Results

47 Applications TransCAD applications for the transportation planning and analysis process

48 47 Land Use and TAZ Overlay Land Use Map TAZ Map Land Use and TAZ Overlay

49 48 I-25 Socioeconomic Data Analysis 1998 Data 2020 Data Land Use Data

50 49 I-25 Corridor Analysis 1998 Data 2020 Data Land Use Data

51 50 Supply and Demand Analysis Demand SupplyDifference

52 51 Colorado Springs Alternatives Analysis

53 52 Buffer Analysis Mile BufferTravel Time Buffers

54 53 Traffic Impact Analysis Trip Distribution for a proposed development

55 54 Traffic Impact Analysis

56 55 Site Selection / Geocoding Fire stations School sites Park locations

57 56 Site Selection / Geocoding

58 57 Travel Sheds / Critical Link Analysis Identify users of a specific facility Analysis for Adequate Community Facilities Ordinances and road fee programs

59 58 GIS-Based Transportation Improvement Programs AgencyProject Funding Amount AnaheimLincoln Avenue Signal Coordination $52,910 AnaheimState College Blvd @ SR-91 $150,000 Buena Park Artesia Blvd @ 1- 5 Interchange $132,795 Costa Mesa Fairview Road$29,846 IrvineBicycle Program$67,200

60 59 Transit Planning and Operations Strategic transit planning University transportation planning Corridor planning Market identification and productivity Management and placement of capital assets

61 60 Land Use / Transportation / Air Quality Conceptual level analysis of LUTRAQ relationship Comprehensive plan updates Triggers – population vs. VMT growth Air quality and emissions inventory Stationary and mobile sources On-road mobile emissions estimation Mobile5 Nonattainment area Energy and fuel consumption

62 61 Air Quality Analysis Link-based emissions Zone-based emissions (i.e. cold starts, evaporate VOCs, etc.) Air quality conformity determinations Redesignation and classification issues Integration with gridded urban airshed modeling Integration with Mobile5

63 62 Land Use / Transportation / Air Quality Available from the performance summary report for the Fort Collins Nonattainment area

64 63 Integrated Air Quality Modeling TransCAD Travel Demand Model (speeds, vehicle miles of travel, time of day, …) EPA Mobile/Part Emissions Models (temperatures, fuel characteristics, emission factors, …) Emissions from On-Road Vehicles

65 64 GIS-Based Emissions Inventories Link-based emissions Zone-based emissions Gridded Overlay for Region

66 65 Intersection Analysis Intersection Flow Diagram Volumes from TransCAD Traffic Counts NCHRP 255 Process VISSIM 3D Animation Synchro Intersection Analysis SimTraffic 2D Animation

67 66 TransCAD Turn Movement Forecasts

68 67

69 68 SimTraffic Micro-Simulation

70 69 VISSIM Micro-Simulation

71 70 VISSIM Micro-Simulation

72 71 VISSIM Micro-Simulation

73 72 VISSIM Micro-Simulation

74 73 VISSIM Micro-Simulation

75 74 VISSIM Micro-Simulation

76 75 VISSIM Micro-Simulation

77 76 VISSIM Micro-Simulation

78 77 Construction Management Modify signal timing in response to construction closures

79 78 Future TransCAD Applications Interactive MPO Project Prioritization and Funding Allocations Traffic Impact Studies: Cumulative improvements and impacts, time of day project distributions FHWA TDM Model Mixed Use Activity Center Trip Generation & Distribution Bicycle Assignments Transportation Corridors Pavement Management

80 LSA Associates, Inc. 132 West Mountain Avenue Fort Collins, CO 80524 970.494.1568

81 Tips, Trips, and Traps of TransCAD Modeling Presented by LSA Associates, Inc. September 2001 North Carolina MPO Conference Fayetteville, NC

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