00795398

Component

http://onlinepubs.trb.org...rculars/ec018/ec018toc.pdf

The U.S. Federal Highway Administration (FHWA) publication, "Roundabouts: An Informational Guide," presents a comprehensive discussion of roundabout planning, performance analysis, and design. One of its features is the definition of six categories of roundabouts, ranging from small, urban mini-roundabouts to relatively large, rural double-lane roundabouts. Distinctions have been made between the various categories in terms of characteristics, planning procedures, operational analysis, and design treatments. This paper presents the various elements of operational analysis included in the guide, including measures of capacity and performance analysis, and provides a discussion of many of the decisions made during the development of the guide. The paper presents capacity curves for urban compact roundabouts, single-lane roundabouts, and double-lane roundabouts, as well as adjustment factors to account for the effect of short lanes (flaring). The paper also presents the methodologies and recommended practices for determining degree of saturation, delay, and queuing.

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E-C018

English

p. 422-433

2000-6

Transportation Research Circular

Fourth International Symposium on Highway Capacity

Figures (7) ; References

Adjustment factors; Guidelines; Highway capacity; Performance; Queuing; Recommendations; Roundabouts; Saturation flow; Traffic delays

Operational analysis

Highways; Operations and Traffic Management; Planning and Forecasting; Research; I72: Traffic and Transport Planning

NTL, TRIS, TRB

Jul 27 2000 12:00AM

• 2+1-ROADS WITH AND WITHOUT CABLE BARRIERS: SPEED PERFORMANCE
• A FURTHER INVESTIGATION ON CRITICAL GAP AND FOLLOW-UP TIME
• A PROBABILISTIC APPROACH TO DEFINING FREEWAY CAPACITY AND BREAKDOWN
• ADVANCING THE FRONTIER OF SIMULATION AS A CAPACITY AND QUALITY OF SERVICE ANALYSIS TOOL
• AN EMPIRICAL STUDY ON THE CAPACITY OF BOTTLENECKS ON THE BASIC SUBURBAN EXPRESSWAY SECTIONS IN JAPAN
• ANALYSIS OF ALTERNATIVE SERVICE MEASURES FOR FREEWAY FACILITIES
• ANALYSIS OF THE INTERRELATIONSHIP AMONG TRAFFIC FLOW CONDITIONS, DRIVING BEHAVIOR, AND DEGREE OF DRIVER'S SATISFACTION ON RURAL MOTORWAYS
• CAPACITY AT ALL-WAY STOP-CONTROLLED AND FIRST-IN-FIRST-OUT INTERSECTIONS
• CAPACITY OF UNSIGNALIZED URBAN JUNCTIONS
• COMPARISON OF FREEWAY SIMULATION WITH INTEGRATION, KRONOS, AND KWAVES
• COMPARISON OF THE HCM AND SINGAPORE MODELS OF ARTERIAL CAPACITY
• DEVELOPMENT OF CAPACITY ESTIMATION METHOD FROM STATISTICAL DISTRIBUTION OF OBSERVED TRAFFIC FLOW
• DEVELOPMENT OF CAPACITY GUIDELINES FOR ROAD LINKS AND INTERSECTIONS FOR HENAN AND HEBEI PROVINCES, PRC
• DISCHARGE CHARACTERISTICS OF HETEROGENEOUS TRAFFIC AT SIGNALIZED INTERSECTIONS
• EFFECT OF DARKNESS ON THE CAPACITY OF LONG-TERM FREEWAY RECONSTRUCTION ZONES
• EFFECT OF ENVIRONMENTAL FACTORS ON FREE-FLOW SPEED
• EFFECT OF RADIUS OF CURVATURE FOR RIGHT TURNING VEHICLES ON THROUGH TRAFFIC DELAY
• EFFECTS OF DRIVER POPULATION ON THE TRAFFIC OPERATIONAL PERFORMANCE OF SIGNALIZED INTERSECTIONS
• EFFECTS OF OD FLOWS ON ROUNDABOUT ENTRY CAPACITY
• EFFECTS OF TRAFFIC CONDITION (V/C) ON SAFETY AT FREEWAY FACILITY SECTIONS
• ESTIMATION OF CRITICAL GAPS AND FOLLOW-UP TIMES AT RURAL UNSIGNALIZED INTERSECTIONS IN GERMANY
• EVALUATION OF MACRO- AND MESOSCOPIC MODELS FOR CONGESTION IMPACT ANALYSIS
• FOURTH INTERNATIONAL SYMPOSIUM ON HIGHWAY CAPACITY, PROCEEDINGS, JUNE 27-JULY 1, 2000, MAUI, HAWAII
• FRAMEWORK TO CONSIDER THE EFFECT OF UNCERTAINTY IN FORECASTING THE LEVEL OF SERVICE OF SIGNALIZED AND UNSIGNALIZED INTERSECTIONS
• HISTORICAL OVERVIEW OF THE COMMITTEE ON HIGHWAY CAPACITY AND QUALITY OF SERVICE
• INTEGRATION OF SAFETY AND THE "HIGHWAY CAPACITY MANUAL"
• LEVEL OF SERVICE CLASSIFICATION FOR URBAN HETEROGENEOUS TRAFFIC: A CASE STUDY OF KANPUR METROPOLIS
• LEVEL OF SERVICE ON FINNISH TWO-LANE HIGHWAYS
• LEVEL-OF-SERVICE MEASURE OF ROAD TRAFFIC BASED ON THE DRIVER'S PERCEPTION
• MACRO SPEED-FLOW MODEL FOR ON- AND OFF-RAMPS ON MULTILANE ROADS
• MULTIMODAL ARTERIAL LEVEL OF SERVICE
• NEW TRANSIT CAPACITY AND QUALITY OF SERVICE MANUAL
• OPERATIONAL CHARACTERISTICS OF WEAVING SECTIONS IN CHINA
• PASSENGER CAR UNITS FOR HETEROGENEOUS TRAFFIC USING A MODIFIED DENSITY METHOD
• PROBABILISTIC MODELS FOR PEDESTRIAN CAPACITY AND DELAY AT ROUNDABOUTS
• TOWARDS AN AREAWIDE SERVICE MEASURE
• TRAFFIC FLOW ANALYSIS BEYOND TRADITIONAL METHODS
• UNBALANCED TRAFFIC VOLUMES AT ROUNDABOUTS
• UNCERTAINTY IN SATURATION FLOW PREDICTIONS
• USE OF SIMULATION TO ANALYSIS OF IMPEDANCE IMPACT AT UNSIGNALIZED INTERSECTIONS
• USER PERCEPTION OF LEVEL OF SERVICE AT SIGNALIZED INTERSECTIONS: METHODOLOGICAL ISSUES
• VEHICLE CLASSIFICATION FOR EXPRESSWAY CAPACITY ANALYSIS IN CHINA