00935348

Component

https://doi.org/10.3141/1802-10

http://scholar.google.com...uchi&publication_year=2002

Many measures have been proposed to represent the status of traffic conditions on arterial roadways in urban areas. The debate about what is the most appropriate measure continues. In a contribution to the debate, another approach was offered. Traditionally, two general approaches exist. One is based on the relationship between supply and demand. The other is a measure relative to the most acceptable status of service quality. The latter measure allows the public to relate to their travel experience. In either case, however, derivation of measures of congestion involves uncertainty because of imprecision of the measurement, the traveler's perception of acceptability, variation in sample data, and the analyst's uncertainty about causal relations. A measure is proposed that is a composite of two traditional measures, travel speed and delay. In recognition of the uncertainty, a fuzzy inference process was proposed. The inputs are travel speed, free-flow speed, and the proportion of very low speed in the total travel time. These values were processed through fuzzy-rule-based inference. The outcome was a single congestion index value between 0 and 1, where 0 is the best condition and 1 is the worst condition. The process was demonstrated using real-world data. The results were compared with those of the Highway Capacity Manual. Although no conclusion can be drawn about the best measure of congestion, the proposed inference process allows the mechanism to combine different measures and also to incorporate the uncertainty in the individual measures so that the composite picture of congestion can be reproduced.

This paper appears in Transportation Research Record No. 1802, Traffic Flow Theory and Highway Capacity 2002.

English

p. 77-85

2002

Transportation Research Record

030907729X

Figures (7) ; References (13) ; Tables (2)

Alternatives analysis; Arterial highways; Measurement; Traffic congestion; Traffic delays; Traffic speed; Uncertainty; Urban areas

Highway Capacity Manual

Fuzzy inference

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB, ATRI

Dec 6 2003 12:00AM

• ADAPTATION OF "HIGHWAY CAPACITY MANUAL" 2000 FOR PLANNING-LEVEL ANALYSIS OF TWO-LANE AND MULTILANE HIGHWAYS IN FLORIDA
• ANALYTIC, MICROSCOPIC MODEL OF TRAFFIC FLOW AND TRAVEL TIME
• APPLICATION OF CAR-FOLLOWING SYSTEMS IN MICROSCOPIC TIME-SCAN SIMULATION MODELS
• APPLICATION OF CAR-FOLLOWING SYSTEMS TO QUEUE DISCHARGE PROBLEM AT SIGNALIZED INTERSECTIONS
• COMPARISON OF DELAY ON ARTERIALS BY SIMULATION AND "HIGHWAY CAPACITY MANUAL" COMPUTATIONS
• COMPARISON OF DELAYS FROM HIGHWAY CAPACITY SOFTWARE, SYNCHRO, PASSER II AND IV, AND CORSIM FOR URBAN ARTERIALS
• COMPARISON OF GREENSHIELDS, PIPES, AND VAN AERDE CAR-FOLLOWING AND TRAFFIC STREAM MODELS
• DESIGN AND IMPLEMENTATION OF CONTROL-THEORY-BASED MICROSCOPIC TRAFFIC FLOW MODEL
• DETAILED OBSERVATIONS OF SATURATION HEADWAYS AND START-UP LOST TIMES
• DEVELOPMENT OF HIGHWAY CONGESTION INDEX WITH FUZZY SET MODELS
• DYNAMIC PROGRAMMING APPROACH FOR ONLINE FREEWAY FLOW PROPAGATION ADJUSTMENT
• EMPIRICAL FEATURES OF CONGESTED PATTERNS AT HIGHWAY BOTTLENECKS
• FIELD EVALUATION OF "HIGHWAY CAPACITY MANUAL" 2000 ANALYSIS PROCEDURES FOR TWO-LANE HIGHWAYS
• GENERAL-PURPOSE METHODOLOGY FOR ESTIMATING LINK TRAVEL TIME WITH MULTIPLE-POINT DETECTION OF TRAFFIC
• HYBRID NEURO-FUZZY APPLICATION IN SHORT-TERM FREEWAY TRAFFIC VOLUME FORECASTING
• KINEMATIC WAVE TRAFFIC FLOW MODEL FOR MIXED TRAFFIC
• MARGINAL DELAY: NEW MEASURE FOR QUALITY OF SERVICE AT SIGNALIZED INTERSECTIONS
• MULTIMODAL CORRIDOR LEVEL-OF-SERVICE ANALYSIS
• MULTIPLE CAR-FOLLOWING DATA WITH REAL-TIME KINEMATIC GLOBAL POSITIONING SYSTEM
• PROPOSED LEVEL-OF-SERVICE METHODOLOGY FOR TOLL PLAZAS
• REAL-TIME INDUCTIVE-SIGNATURE-BASED LEVEL OF SERVICE FOR SIGNALIZED INTERSECTIONS
• RECONSTRUCTION OF FALSE AND MISSING DATA WITH FIRST-ORDER TRAFFIC FLOW MODEL
• REVIEW OF EMPIRICAL RESEARCH ON CONGESTED FREEWAY FLOW
• SIMULATION OF FREEWAY WEAVING AREAS
• TECHNIQUE FOR COMPARING OPERATION OF ALTERNATIVE INTERCHANGE TYPES
• TOTAL CAPACITIES AT ALL-WAY STOP-CONTROLLED INTERSECTIONS: VALIDATION AND COMPARISON OF "HIGHWAY CAPACITY MANUAL" PROCEDURE AND ADDITION-CONFLICT-FLOW TECHNIQUE
• UNCERTAINTY IN OPERATIONAL ANALYSIS OF TWO-LANE HIGHWAYS
• VARIATIONS IN CAPACITY AND DELAY ESTIMATES FROM MICROSCOPIC TRAFFIC SIMULATION MODELS