THE CAPABILITY AND ENHANCEMENT OF VDANL AND TWOPAS FOR ANALYZING VEHICLE PERFORMANCE ON UPGRADES AND DOWNGRADES WITHIN IHSDM
This report documents the results and recommendations for defining and analyzing "Vehicle Performance on Upgrades and Downgrades" on two lane rural roads. The contract objective was to develop functional requirements (and identify gaps) to enhance the capability of the Interactive Highway Safety Design Model (IHSDM) in evaluating vehicle operations on upgrades and downgrades, and to provide outputs useful for evaluating grade steepness and the location and design of climbing lanes and emergency escape ramps. The analysis procedures involve the use of two simulation programs: VDANL, a vehicle dynamics simulation; and TWOPAS, a traffic flow simulation. This report includes recommendations for the best approach for applying both VDANL and TWOPAS, the planned improvements to the programs, and data collection and research needed for software enhancement, calibration, verification and validation. Case studies of an example upgrade and downgrade are also included to help support the recommended enhancements.
- Record URL:
- Record URL:
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Supplemental Notes:
- Publication date is taken from report documentation page; date on cover is August 2000.
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Corporate Authors:
Systems Technology, Incorporated
13766 South Hawthorne Boulevard
Hawthorne, CA United States 90250Federal Highway Administration
Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
McLean, VA United States 22101 -
Authors:
- Allen, R W
- Harwood, D
- Chrstos, J P
- Glauz, W D
- Publication Date: 2000-1-21
Language
- English
Media Info
- Features: Appendices; Figures; References; Tables;
- Pagination: 138 p.
Subject/Index Terms
- TRT Terms: Case studies; Climbing lanes; Escape lanes; Highway design; Road downgrades; Rural highways; Simulation; Traffic flow; Two lane highways; Upgrades (Roads); Vehicle dynamics; Vehicle operations
- Identifier Terms: Interactive Highway Safety Design Model; TWOPAS (Computer program); VDANL (Computer program)
- Subject Areas: Design; Highways; Planning and Forecasting; Terminals and Facilities; I21: Planning of Transport Infrastructure;
Filing Info
- Accession Number: 00802555
- Record Type: Publication
- Report/Paper Numbers: FHWA-RD-00-078,, Final Report
- Contract Numbers: DTFH61-98-F-00364
- Files: NTL, TRIS, ATRI, USDOT
- Created Date: Nov 17 2000 12:00AM