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2. Year 2007 and 2035 socioeconomic data files (TransCAD and GIS) for the TPO region, including any maps, graphs, charts, or tables developed as part of the RPA’s internal review;

3. Populated validation worksheet upon completion of draft validated model. This worksheet will include statistics for Trip Generation, Trip Distribution, Mode Choice (if applicable), and Traffic Assignment. If the assumptions included in submittal #1 change as part of the validation process, they will be documented and submitted for approval at this time; and

4. Full model documentation report and user’s guide, along with all TransCAD files, after the draft LRTP has been documented.

This technical memorandum constitutes Submittal #1 defined above. Below is an outline of modeling inputs and structure for each step of the traditional four-step modeling process.

Further details addressing each output statistic or map required as a result of the TDOT Division Procedure are attached, both for the previous 2000 model and what is anticipated as part of the 2007 model. The attached table also incorporates recommendations from the report developed by the University of Tennessee, Center for Transportation Research, titled “Minimum

1.0 TRIP GENERATION (includes Network data)

1.1 Network Data – The base year model network is being updated from year 2000 to 2007.

1.1.1 Network Refinement - Several roads are being added to the model network to more accurately depict travel patterns and to assist with splitting several of the larger traffic analysis zones (TAZs). TRIMS and Roadway Characteristics (RC) data were obtained from TDOT and GDOT, respectively, to assist with reviewing the link characteristics (facility type and number of lanes) currently in the model network. In addition, several windshield surveys were conducted to obtain area type, facility type, and number of lanes data for those roads being added to the model.

1.1.2 Traffic Counts – Daily traffic counts will also be updated in the 2007 network using available count data from TDOT, GDOT, Hamilton County and the City of Chattanooga. Count data was not available from Catoosa, Dade, or Walker Counties. Supplemental 24-hour count data by vehicle classification will be collected in late September 2008 to supplement model validation efforts and assist with evaluating existing conditions for the Congestion Management Plan (CMP).

Transportation Projects – Several lists of capacity-adding transportation projects included in each model year are being or will be developed as part of the LRTP update process. Each of these project lists will be provided upon completion to TDOT and GDOT, as well as the entire Interagency Consultation Committee (ICC). They are as follows:

• Year 2007 Projects - Projects that completed construction between the years 2000 and 2007 (currently being developed)

• Existing-Plus-Committed (E+C) Projects - Projects that are expected to complete construction between the years 2008 and 2011 (i.e. those in the Transportation Improvement Program (TIP)) (currently being developed)

• Year 2035 Financially Feasible Plan Projects – Projects funded in LRTP

• Year 2025 Funded Projects – Interim year 2025 funded projects

• Year 2015 Funded Projects – Interim year 2015 funded projects

1.2 Socioeconomic Data – The Regional Planning Agency (RPA) is currently developing the 2007 and 2035 socioeconomic data for the entire TPO region. Upon completion, Cambridge Systematics (CS) will conduct a thorough review of the data at the TAZ level, including the development of population, household, employment, hotel-motel, and school enrollment density maps. The TransCAD and GIS files, as well as the maps and any tables, charts, or graphs, will be provided to TDOT and GDOT for review as part of Submittal #2.

current TransCAD model. Many of the TAZs are rather large in the outlying areas.

Additional network detail being added to the model will also effect the TAZ structure, including external zones.

1.4 Travel Survey Data – During the 2030 LRTP Update adopted in 2005, the Chattanooga Household Travel Diary Survey conducted in 2002 was used to determine trip production rates for person trips. The Federal Highway Administration (FHWA) Quick Response Freight Manual (QRFM) was used to supply trip production rates for the truck trip purposes. Trip attraction rates were borrowed from the Northeast Regional Planning Model (NERPM) in Jacksonville, FL, as local data was not available. These same trip production and attraction rates will be used for this model update. Although the percent split of Internal-External (IE)/External-External (EE) trips at each external station was developed from the Chattanooga Urban Area Origin-Destination Study conducted in 2002, it was found that the original MinUTP model had more reasonable IE/EE splits due to how the O-D study was conducted. With the exception of new external stations, the updated model as part of the 2035 LRTP Update will use the same IE/EE splits from the MinUTP model. Any new external stations, which will likely be minor roads with low traffic counts, will likely assume 100 percent IE trips.

1.5 Trip Generation Method – During the 2030 LRTP Update adopted in 2005, the 2002 Chattanooga Household Travel Survey data was evaluated to determine what variables impact travel patterns the most in the Chattanoga region. As a result, a cross-classification method based on auto availability and children per household was implemented. This same method will be using during this update.

1.6 Trip Purposes – The current TransCAD model includes the following trip purposes, which will remain the same during this update:

• Home-Based Work (HBW)

• Home-Based School (HBSchool)

• Home-Based Shop (HBShop)

• Home-Based Social/Recreation (HBSR)

• Home-Based Other (HBO)

• Non-Home Based (NHB)

• Light-Duty Truck (LDTK)

• Medium-Duty Trucks (MDTK)

• Heavy-Duty Trucks (HDTK)

1.7 Special Generators – The current TransCAD model includes special generators at the airport, the University of Tennessee at Chattanooga, Chattanooga State College, and

may eventually be necessary.

2.0 TRIP DISTRIBUTION

2.1 Friction Factors - The friction factor file used in the new CHCNGA 2000 TransCAD model is similar to the file used in the CHCNGA 2000 MINUTP model. The key difference is the number of trip purposes. Since separate friction factors were not available for the expanded home-based other purposes, the same home-based other friction factors were used for home-based school, home-based shop, and home-based social recreation trips. Gamma functions from the Quick Response Freight Manual were used for truck purposes. These same friction factors will be assumed for the 2007 model and future years. If time permits, the friction factors may be calibrated.

2.2 Terminal Times – Terminal times were used in the 2000 model and will also be used in the 2007 model.

2.3 K-Factors – K-Factors were used in the 2000 model. To improve the Georgia/Tennessee State Line screenline in the 2000 model, a 0.25 K-Factor was added from zones in Georgia to zones in Tennessee. To improve the Tennessee River Crossing screenline, a 0.25 K-Factor was added to zones from the north side of the bridges to the rest of the model region. No K-Factors will be assumed at the beginning of the 2007 model validation process, however, they may be added if necessary.

3.0 MODE CHOICE

The current TransCAD model for Chattanooga does not include a mode choice/transit component. Instead, it includes an auto occupancy model that converts person trips to vehicle trips using auto occupancy factors by trip purpose derived from the 2002 Household Travel Diary Survey conducted in the Chattanooga region.

Dependent upon available data, the RPA was considering adding a mode choice/transit pathbuilding component to the TransCAD model as part of the 2035 LRTP Update. However, since the August 20, 2008 modeling workshop referenced above, it was determined that there is not enough data currently available to validate a mode choice/transit pathbuilding model. As a result, the RPA, in coordination with CARTA, is considering conducting an on-board transit survey in the Spring of 2009 with the intention of building a mode choice model in the Summer and Fall of 2009. However, it will not be included as part of the 2035 LRTP Update. Therefore, the current auto occupancy model will remain in place for the 2035 LRTP Update.

4.0 TRIP ASSIGNMENT

4.1 Time-of-Day – Currently, the Chattanooga model does not include a true time-of-day component. Instead, peak hour factors based on the temporal distribution from the 2002 Household Travel Diary Survey are applied to the daily volumes after the assignment process to achieve AM and PM peak hour volumes. There is the potential