01099160

Component

Present roundabout capacity models utilize gap acceptance models or empirical models to determine capacity at approaches to a roundabout. Capacity calculations for a roundabout are determined as the capacity of approaches based on the circulating flow around the roundabout. In this paper we propose a novel approach to analyzing roundabouts. A new performance measure “Maximum Average Flow” is used to determine flows on approaches so as to ensure that there is no gridlock. This paper demonstrates that the maximum number of vehicles that can exit from the roundabout is dependent upon the average trip length and the average maximum flow around the roundabout that can be obtained. A control strategy based on the average flow and average trip length is proposed. The macroscopic properties and the control strategies are tested on one lane and two lane roundabout using microscopic simulation.

01084478

08-1399

English

17p

2008

Transportation Research Board 87th Annual Meeting

DVD

Figures (11) ; References (16)

Gap acceptance; Highway capacity; Interchanges and intersections; Microscopic traffic flow; Operations; Roundabouts; Traffic circles; Traffic simulation; Types of intersections

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

Transportation Research Board Annual Meeting 2008 Paper #08-1399

TRIS, TRB

Jan 29 2008 3:45PM