The 1998 Lincoln Model Update was conducted primarily to support the development of the 20-year Transportation Plan and included innovative concepts in transportation modeling: a Geographic Information System (GIS) interface, estimation of local model parameters using the 1995 National Personal Transportation Survey (NPTS), and use of observed travel time to develop input speeds and speed-based measures of effectiveness (MOEs). The GIS interface was developed to transfer data between the ARCINFO database and the transportation model network in TP+ format. This allows the transfer of roadway attributes for use in the model and model volumes, speeds, and travel times for display using the GIS maps. The 1995 NPTS was used to develop model parameters for Lincoln in lieu of a local household survey. Trip rates, lengths and peaking factors were estimated using samples within the census district including Nebraska. Results yielded significantly different model parameters than those used previously (developed from NCHRP Report 187) and from national averages estimated from the NPTS. Data on travel time were observed for both off-peak and peak conditions, covering 35% of total roadway mileage in Lincoln. The off-peak travel time was used to develop a lookup table with representative operational input speeds by averaging speeds weighted by distance for each combination of functional type and area type. These speeds incorporate effects of signal delay, density of access points, weaving, and driver characteristics. The peak travel times were used to develop speed-based MOEs and as a validation tool for the model output speeds.


  • English

Media Info

  • Features: References; Tables;
  • Pagination: p. 164-168

Subject/Index Terms

Filing Info

  • Accession Number: 00793291
  • Record Type: Publication
  • ISBN: 0965231046
  • Files: TRIS
  • Created Date: May 25 2000 12:00AM