CAPACITY CONSTRAINTS OF URBANS ROADS NETWORKS
I VINCOLI DI CAPACITA' DELLE RETI STRADALI URBANE
FOR TRAFFIC ASSIGNMENT PURPOSES LINK FLOWS OF URBAN SIGNALIZED NETWORKS MUST RESPECT TWO CAPACITY CONSTRAINTS: AN ENVIRONMENTAL CONSTRAINT AND A PHYSICAL ONE. INTO THIS CONTEXT, THE FIRST SECTION OF THIS PAPER PROVIDES A DEFINITION AND EVALUATION OF LINK PHYSICAL CAPACITY EXPRESSING IT AS FUNCTION OF THE MAXIMUM QUEUE LENGTH THAT CAN BE ACCOUNTED ON THE LINK. THE APPROACH TO THIS PROBLEM IS PROBABILISTIC, RESPECTING THE RANDOM NATURE OF MECHANISMS BY WHICH QUEUES TAKE PLACE AND DEVELOP AT INTERSECTIONS. PHYSICAL CAPACITY CONSTRAINTS ARE DERIVED FROM THIS RESEARCH. THEY ARE EXPRESSED BY CONVEX FUNCTIONS RESULTING IN ACCORDANCE WITH EQUILIBRIUM TRAFFIC THEORY. IN THE SECOND PART, THE QUEUE LENGTH AT INTERSECTIONS, WHOSE APPROPRIATECALCULATION IS NECESSARY FOR ESTIMATING CAPACITY, IS USED FOR COMPARING TWO DIFFERENT METHODOLOGIES OF INTERSECTION ANALYSIS AND RELATED EQUILIBRIUM ASSIGNMENT ALGORITHMS: THE CONVENTIONAL INTERSECTION REPRESENTATION, WHICH LEADS TO A SYMMETRIC EQUILIBRIUM MODEL SOLVED BY THE FRANK AND WOLFE ALGORITHM, AND A DETAILED REPRESENTATION WHICH LEADS TO AN ASYMMETRIC EQUILIBRIUM MODEL WHOSE SOLUTION IS BASED ON THE JACOBIAN'S COSTS' MATRIX DIAGONALIZATION.
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/11208732
-
Corporate Authors:
N/A
, United States -
Authors:
- RUBERTI, G
- Publication Date: 1995-6
Language
- Italian
Media Info
- Pagination: p. 98-105
-
Serial:
- T&T: TRASPORTI E TRAZIONE
- Volume: 8
- Issue Number: 3
- Publisher: N/A
- ISSN: 1120-8732
Subject/Index Terms
- TRT Terms: Calculation; Evaluation and assessment; Highway capacity; Intersections; Mathematical analysis; Mathematical models; Methodology; Networks; Queuing; Roads; Traffic flow; Traffic signals; Urban areas
- Uncontrolled Terms: Road networks
- ITRD Terms: 6471: Analysis (math); 6464: Calculation; 643: Capacity (road, footway); 9020: Evaluation (assessment); 455: Junction; 6473: Mathematical model; 9102: Method; 6594: Queue; 1053: Road network; 671: Traffic flow; 565: Traffic signal; 313: Urban area
- Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting;
Filing Info
- Accession Number: 00715751
- Record Type: Publication
- Source Agency: TRL
- Files: ITRD
- Created Date: Jan 31 1996 12:00AM