01366486

Component

https://doi.org/10.3141/2312-06

http://scholar.google.com...indi&publication_year=2012

Modern roundabouts that have unsignalized pedestrian crossings typically provide right-of-way to pedestrians, and therefore vehicles entering or exiting the roundabout must yield to pedestrians. The requirement that vehicles seek gaps in the pedestrian stream results in four distinct sources of delay to vehicles traversing the roundabout. Existing analytical methods for estimating delays to vehicles entering roundabouts typically consider only one of these four sources and ignore the other three. This paper presents an analytical model for estimating delays to vehicles traversing a single-lane roundabout. The model is based on gap acceptance and queuing models and explicitly estimates delays for each of the four sources for each origin–destination movement in the roundabout. The proposed model is evaluated for a typical single-lane roundabout by comparing the model estimates with estimates obtained from the VISSIM simulation model and the Highway Capacity Manual (HCM) method for a range of traffic and pedestrian volumes. The results of this evaluation demonstrate that the proposed model is superior to the HCM method and provides delay estimates that are comparable with those obtained from microsimulation modeling. Further research is recommended to validate the model results by using field data.

01470175

12-0930

English

pp 56–66

2012

Transportation Research Record: Journal of the Transportation Research Board

9780309263108

Print

Figures; References; Tables

Gap acceptance; Pedestrian traffic; Queuing theory; Roundabouts; Traffic delays; Traffic models; Traffic volume

Pedestrian volume

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Feb 8 2012 4:58PM

• Bus Contraflow Lane: Improved Contraflow Approach in Freeway Evacuation
• Changes in Evacuation Decisions Between Hurricanes Ivan and Katrina
• Comparison of Time-Dependent Sequential Logit and Nested Logit for Modeling Hurricane Evacuation Demand
• Delay Analysis of Single-Lane Roundabout with a Slip Lane Under Varying Exit Types, Experimental Balanced Traffic Volumes, and Pedestrians, Using Microsimulation
• Dynamic Traffic Assignment Evaluation of Hurricane Evacuation Strategies for the Houston–Galveston, Texas, Region
• Effect of Pedestrian Impedance on Vehicular Capacity at Multilane Roundabouts with Consideration of Crossing Treatments
• Empirical Estimation of Capacity for Roundabouts Using Adjusted Gap-Acceptance Parameters for Trucks
• Evacuee Route Choice Decisions in a Dynamic Hurricane Evacuation Context
• Examining Statewide Public Perceptions of Roundabouts Through a Web-Based Survey
• Modeling Risk Attitudes in Evacuation Departure Choices
• Optimization of Vehicle Travel Position on Roundabouts in Snowy Cold Regions
• Simulator Study of Driver Responses to Pedestrian Treatments at Multilane Roundabouts
• Statistical Analysis and Development of Crash Prediction Model for Roundabouts on High-Speed Rural Roadways
• Travel Time Reliability During Evacuation: Impact of Heterogeneous Driving Behavior
• Turning Angle Effect on Emergency Egress: Experimental Evidence and Pedestrian Crowd Simulation
• Use of Regional Transportation Planning Tool for Modeling Emergency Evacuation: Case Study of Northern New Jersey