A Sensitivity Evaluation of Traffic Assignment

Details

• Creators:
  Buechler, Jay ; Stover, Vergil G. ; Benson, J. D.
• Corporate Creators:
  Texas Transportation Institute. Texas A&M University
• Corporate Contributors:
  Texas State Department of Highways and Public Transportation ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Transportation planning
  • Urban transportation
  • Traffic assignment
  • Sketch planning
  • Evaluation
  • Sensitivity analysis
  • Trip generation
• Resource Type:
  Tech Report
• Right Statement:
  17-2
• Geographical Coverage:
  Texas ; United States
• Edition:
  Interim: September, 1973 - August, 1975
• Corporate Publisher:
  Texas Transportation Institute. Texas A&M University
• Abstract:
  The purpose of this study was to investigate the sensitivity of traffic assignment of input from the preceding modeling phases (i.e.' the trip generation and trip distribution phases). The analyses focused not only on sensitivity of assignment results to inaccuracies from the modeling phases, but the sensitivity of various commonly used measures of assignment accuracy in discerning such inaccuracies. The results indicate that the percent RMS error is the measure most sensitive to trip matrix inaccuracies, while the total vehicle miles of travel (VMT) was the least discriminating. The analyses further demonstrate that, due to the aggregative nature of the assignment procedure, many differences that may be observed at the zonal level and zonal interchange level tend to disappear in the assignment results. Based on the results of these analyses, a "short-cut" (sketch planning) approach is proposed, which would be expected to produce assignment results of sufficient accuracy for preliminary system evaluation and comparison with other alternatives similarly modeled.
• Format:
  PDF
• Funding:
  2-10-74-17
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/83611/dot_83611_DS1.pdf
• File Type:
  [PDF - 3.49 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:1fec03c11c52c23d2cb83a5b23132476443a56d128f48efe71a497bba8f382f6be2bbe2658d02880c03d5fff55d078252b3a56f935f3da79871246043fd18640