HOV Improvements on Signalized Arterials in the Seattle Area. Volume IV, Simulation Planning and Evaluation

The main research objective of this study is to improve the limitations of arterial traffic simulation models TRAF-NETSIM and TRANSYT-7F so that they can be used to overcome HOV lane planning deficiencies. For instance, after integrating the improved traffic operation models, the evaluation methods can be more adequate for consideration of complex variables associated with arterial HOV lanes. The traffic impacts of HOV lanes can be analyzed from these improved traffic models; therefore, the relationship between traffic impacts and mode shift behavior can be modeled more accurately. Finally, the guidelines to install a successful HOV lane can be derived according to the results of HOV lane evaluation. In brief, the objectives of this study are to:

1. Modify the logic of TRAF-NETSIM turning movements for simulating arterial HOV lanes realistically.

2. Modify the calculation algorithms of TRAF-NETSIM link statistics to provide the travel time of each vehicle type for HOV lane evaluation.

3. Develop the smoothing factor analytical method for TRANSYT traffic platoon dispersion model so that this model can be enhanced and applied appropriately in mixed-flow and priority lane traffic analysis.

4. Develop two iteration algorithms for TRANSYT traffic platoon prediction so that this model can simulate congested flow accurately.

The scope of this study is limited to focus on the planning process of arterial concurrent flow HOV lanes using traffic simulation models TRAF-NETSIM and TRANSYT-7F.

Publication Date: 
Monday, February 1, 1993
Publication Number: 
WA-RD 301.4
Last modified: 
10/12/2016 - 15:41
Nancy L. Nihan, Ho-Chuan Chen.
Washington State Transportation Center (TRAC)
Number of Pages: 
Alternatives analysis, Arterial highways, Carpools, Data collection, Forecasting, Guides to the literature, High occupancy vehicle lanes, Information organization, Literature reviews, Mathematical models, Measures of effectiveness, Metropolitan areas, Origin and destination, Questionnaires, Streets,