Network Assignment of Highway Truck Traffic in FAF

Network Assignment of Highway Truck Traffic in FAF 3 Maks Alam, PE Research Leader Battelle BUSINESS SENSITIVE 1

Task Flow Task #1 Update the FAF Network Link Attributes Data Task 3 Truck Trips, Payload and PCE Factors Task 2 Deliverable #1 Pre-Assign non-FAF Traffic Counts FAF 3 Network Task 4 FAF 3 Assignments Task 5 Deliverable #2 FAF 3 Network with 2007 Assignments Deliverable #3 FAF 3 Forecast Year Assignments FAF 3 Network with 2040 Forecast Assignments Task 6 Deliverable #4 Documentation Technical Report BUSINESS SENSITIVE 2

Process Description Task 1: Update FAF 3 Highway Network • Updating of the FAF 3 network for NHS, Intermodal connectors, and urban by-pass other State specific sources for major highway realignment. • Integration and updating of NN designation, NHS designation changes (up to-date March 2010), LCV network designation, state truck and hazmat route designation, state truck route restriction, limited bridge clearance Task 2: Pre-Assigning non-FAF Traffic Counts to the FAF 3 Network • Integrate HPMS 2008 data with FAF 3 network using a series of state specific route matching algorithms customized for each State. • Develop algorithms to translate the HPMS traffic-flow information to the FAF network domain • Calibrate state traffic flows and truck percentage at the state and urban boundaries Task 3: Truck Trips, Payload and Passenger Car Equivalency Factors • Revise FAF-2 algorithms and factors using the TEP project completed for FHWA in 2009. • Update the conversion tools developed by Battelle during FAF-2 to reflect the new changes in FAF-3 zone and gateways system and the range of operation by truck classes • Develop Truck based O-D matrix using the TEP and allocation of tonnage by truck classes. BUSINESS SENSITIVE 3

Process Description Task 4: Assignment of FAF 3 Flows to the Highway Network • Develop and update FAF-2 link specific Impedance factors • Develop and identify disaggregation network specific nodes to develop 123 by 123 OD matrix to 4609 by 4609 O-D matrix • Develop disaggregation factors for domestic and international movements. • Use Trans. CAD SUE traffic assignment with passenger volume as preloaded volume on the network • Calibrate flow by adjusting initial link impedance, alpha, beta values, and disaggregation factors • Use BPR delay functions • Multiple trial and error iteration until FAF truck flows is comparable with the state truck flows develop in task 2 • Compare HPMS truck VMT with the FAF truck VMT for the base year 2007 BUSINESS SENSITIVE 4

FAF Tonnages to Truck Conversion steps Calibrate mean payloads (e. g. VTRIS weight data) Identify vehicle groups Select major body types 10/21/2021 Calculate mean payloads by vehicle group and body type Analyze Regional variability Calculate TEF -National -Regional Calculate percent distribution by vehicle group and body type BUSINESS SENSITIVE 5

Vehicle Groups 1. Straight trucks 2. Straight truck plus trailer 3. Tractor plus trailer 4. Tractor plus double trailers 5. Tractor plus triple trailers 10/21/2021 BUSINESS SENSITIVE 6 6

Major Body Types • Dry Van • Logging (2. 1%) • Platform (24. 4%) • Livestock • Bulk • Automobile • Reefer • Other (37. 7%) (14. 7%) (8. 2%) (1. 7%) (0. 9%) (2. 3%) • Tank (7. 9%) 10/21/2021 BUSINESS SENSITIVE 7

Conversion Algorithms • Xi tons of commodity i carried by truck type Yj and body type k = Xi βijk • Number of truck type Yj and body type k to move Xi βijk tons commodity i = Xi βijk / ωijk βijk = fraction of commodity i moved by truck type j with body type k ωijk = mean payload of commodity i by truck type j body type k 10/21/2021 BUSINESS SENSITIVE 8 8

Conversion Algorithms Continue 10/21/2021 FAF 3: Task 3 Truck Trips, BUSINESS SENSITIVE 9 9

FAF-3 Freight Travel Demand Model FAF 3 O-D (123 by 123 zones) Step 1 Disaggregation Techniques Develop O-D Share Proportioning -Truck Volume - CBP -warehouse cluster Domestic International Logistical Impacts Trip Distribution Model Validity Test Inflow/Outflow County-to-County FAF 2 O-D Matrix Impedance Function Calibration (Use FAF-2 base TLD) Step 3 FAF 3 Network Assignment (SUE) Tri-Proportional Gravity Model Gamma (combined) Function Step 2 Disaggregate by Domestic, Port and Border Crossings BUSINESS SENSITIVE The dotted loop portion of the figure indicates that the process is iterative until a best possible solution is accomplished BUSINESS SENSITIVE 10

Border Crossings Trip O-D nodes BUSINESS SENSITIVE 11

Inlands and Deep Water Trip O-D nodes BUSINESS SENSITIVE 12

FAF-3 Truck Trip O-D nodes BUSINESS SENSITIVE 13

Domestic Flow (Preliminary) BUSINESS SENSITIVE 14