Study of vehicle speed in the design of roundabouts

Some roundabout design elements significantly influence the vehicle driving speed, i.e. the trajectory of vehicles at roundabouts, which is directly responsible for the level of service and traffic safety at roundabouts. An "in situ" speed, taken as a significant roundabout-design element, is analysed in the paper using as an example four urban single-lane roundabouts located in the City of Zagreb. The American method and the Australian method are used for the definition and verification of the design speed at roundabouts. Results obtained show correlation between the design speed and the actual vehicle speed measured at roundabouts.

[1]  Hrvoje Pilko,et al.  Analysis of Capacity of Roundabouts in the City of Zagreb according to HCM C-2006 and Ning Wu methods , 2012 .

[2]  Davor Brčić,et al.  Speed as an Element for Designing Roundabouts , 2012 .

[3]  Bhagwant Persaud,et al.  Comparison of Safety Performance Models for Urban Roundabouts in Italy and Other Countries , 2011 .

[4]  Bhagwant Persaud,et al.  Safety Effect of Roundabout Conversions in the United States: Empirical Bayes Observational Before-After Study , 2001 .

[5]  Elżbieta Macioszek,et al.  Analiza prędkości przejazdu pojazdów przez skrzyżowania z ruchem okrężnym , 2012 .

[6]  Hesham Rakha,et al.  Energy and Environmental Assessment of High-Speed Roundabouts , 2009 .

[7]  Janusz Chodur.  Capacity Models and Parameters for Unsignalized Urban Intersections in Poland , 2005 .

[8]  António Luís Pimentel Vasconcelos,et al.  COMPARISON OF PROCEDURES TO ESTIMATE CRITICAL HEADWAYS AT ROUNDABOUTS , 2013 .

[9]  Aleksandra Deluka-Tibljaš,et al.  Optimizacija projektnih elemenata kružnog raskrižja , 2013 .

[10]  Tomaz Tollazzi,et al.  Calibration of microsimulation traffic model using neural network approach , 2013, Expert Syst. Appl..

[11]  Jaisung Choi,et al.  Safety analysis of roundabout designs based on geometric and speed characteristics , 2013 .

[12]  Abishai Polus,et al.  Analysis and Evaluation of the Capacity of Roundabouts , 1997 .

[13]  Ivan Dadić,et al.  Comparison of Delays at Signal-Controlled Intersection and Roundabout , 2009 .

[14]  Hrvoje Pilko,et al.  Introduction on Roundabouts in Croatia - Preliminary Experiences , 2010 .

[15]  Raffaele Mauro,et al.  Functional and Economic Evaluations for Choosing Road Intersection Layout , 2012 .

[16]  Rune Elvik,et al.  Effects on Road Safety of Converting Intersections to Roundabouts: Review of Evidence from Non-U.S. Studies , 2003 .

[17]  C Hydén,et al.  The effects on safety, time consumption and environment of large scale use of roundabouts in an urban area: a case study. , 2000, Accident; analysis and prevention.

[18]  Margarida C. Coelho,et al.  Effect of Roundabout Operations on Pollutant Emissions , 2006 .

[19]  Giuseppe Guido,et al.  Comparing Safety at Signalized Intersections and Roundabouts Using Simulated Rear-End Conflicts , 2008 .

[20]  Tomaž Tolazzi.  THE CONTRIBUTION TO THE PROCEDURE OF CAPACITY DETERMINATION AT UNSIGNALIZED PRIORITY-CONTROLLED INTERSECTIONS , 2004 .