NORTH CAROLINA MODELING GUIDELINES T H E N E X T G E N E R A T I - PowerPoint PPT Presentation

NORTH CAROLINA MODELING GUIDELINES T H E N E X T G E N E R A T I O N A N D B E Y O N D Daniel L. Thomas, PE Leta F. Huntsinger, PhD, PE

INTRODUCTION AND MOTIVATION • North Carolina Profile • Motivation • Changing workforce • Changes in scope and responsibility • Loss of institutional knowledge • Development of standard modeling guidelines and procedures

EXISTING APPLICATIONS AND FINDINGS • NCDOT • Used across North Carolina • Measures of success • Four rounds of staff training • Challenges • Implementation outside of North Carolina • Insights • Identified enhancements (focus of this presentation)

GEN2 - ENHANCEMENTS • Updated household classification model • Special generators and special markets • Commercial vehicle model • External trip model • Formula based capacity calculations • Graphical User Interface and Improved Reporting

HOUSEHOLD CLASSIFICATION MODEL • Updated Census data • SF1 • 5-year ACS • Cluster Analysis • Models • Household size • Household vehicles • Joint disaggregation

SPECIAL GENERATORS AND SPECIAL MARKETS Special Generator Special Market • Specialized land use • Specialized land use like university or airport like regional shopping • Trip generation, or hospital distribution, time-of-day • Trip attraction and or mode choice characteristics not not reflected by other reflected by standard trip purposes rates • Best captured through a separate trip purpose or separate submodel

SPECIAL GENERATORS AND SPECIAL MARKETS Special Generator Special Market • Three standard classes: • Separate sub-model • Hospitals • Trip generation • Regional malls • Trip distribution • Universities • Time of day • Rates by trip purpose • Generalized integration • Implementation • Default parameters • New SE data fields • Script modifications

COMMERCIAL VEHICLE MODEL • Three vehicle classes • Autos/vans, pickups, trucks Original • Productions: TAZ CVs by type • Attractions: TAZ employment by type • New vehicle classes • CVs, SUT, MUT Revised • Productions/Attractions: TAZ employment by type • Rates developed from recent CV survey

EXTERNAL STATION ANALYSIS • Trip Purposes: • Through Trips (EE) • External Internal (EI) and Internal External (IE) EI IE EE

EXTERNAL TRIP MODEL D E F I N I N G S U B A R E A S

EXTERNAL TRIP MODEL • IE/EI Model • EE Model • Population (S, Z) • Population (S) • Households (S, Z) • Employment (S) • Area (S) • Area (S) • IX productions (S) • AWDT (L) • Emp. By Type (Z) • External volume (L) • Dist. to nearest station (Z) • Avg. distance nearest 3 • Facility type: stations (Z) Interstate, Arterial, • Avg. IE/EI productions at Local (L) nearest 3 stations (Z) S = subarea; Z = TAZ; L = link

EXTERNAL TRIP MODEL IE/EI Validation EE Validation

FORMULA BASED CAPACITY • R-package (hcmr) • Link variables • Facility type • Area type • Speed limit • Median treatment • Lanes per direction • Terrain • Includes error handling • Populates link database

GUI Modifications and Enhancements

NEXT STEPS Update default rates and parameters • NCDOT participated in NHTS add-on program • Use new NHTS data to re-estimate models GitHub • Current model maintained on several computers and distributed via DVD • Move platform to GitHub to facilitate updates, version tracking, and delivery Wiki • All documentation currently maintained in MS Word files and delivered via PDF • Move documentation to interactive Wiki document Expand Training • Current training is provided to NCDOT staff only • Expand training to include MPOs and RPOs Other

CONTACT INFORMATION • Leta Huntsinger, PhD, PE WSP / Parsons Brinckerhoff huntsinger@pbworld.com • Dan Thomas, PE NCDOT – Transportation Planning Branch (retired) danlthomas@att.net • Tae-Gyu Kim, PhD NCDOT – Transportation Planning Branch tae-gyukim@ncdot.gov