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Title:

Research on Some Specific Aspects of Polish Small Roundabouts Operation

Accession Number:

01123026

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

As small roundabouts are becoming an increasingly popular type of at-grade intersections, researchers are encouraged to study new computational methods and carry out comprehensive studies of small roundabouts performance. Some aspects of their operation are of special interest, i.e. their operation in a situation of changes of the dominant flows throughout the day, possibility of certain increase of the capacity of one-lane small roundabouts without necessity of building a two-lane roundabout or other type of intersection and also an impact of small roundabout geometry on traffic safety, represented in an indirect way by the impact on speed on its consistency. The paper presents results of analytical study (first case) and empirical studies of two other issues. Small roundabouts became very fashionable. Decisions on their construction instead of other intersection type are made without sufficient traffic analysis, which is indispensable, particularly at large variations of size and directional composition of traffic flows as well as in the cases of predicted demand flows close to capacity. The paper presents analytical study of the first issue and a model of capacity of a right-turn bypass used on several Polish roundabouts that can carry large right-turn movements. The last part presents results of empirical studies of operating speed of vehicles negotiating a roundabout and analyses of impacts on speed of such design elements as: inscribed circle diameter, widths of approach, entry, circulatory roadway and exit as well as entry and exit radii.

Monograph Accession #:

01120148

Report/Paper Numbers:

09-2513

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Tracz, Marian
Chodur, Janusz

Pagination:

16p

Publication Date:

2009

Conference:

Transportation Research Board 88th Annual Meeting

Location: Washington DC, United States
Date: 2009-1-11 to 2009-1-15
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures; Photos; References (10) ; Tables (2)

Geographic Terms:

Poland

Subject Areas:

Highways; Operations and Traffic Management; Safety and Human Factors; I72: Traffic and Transport Planning

Source Data:

Transportation Research Board Annual Meeting 2009 Paper #09-2513

Files:

TRIS, TRB

Created Date:

Jan 30 2009 6:52PM