Kinzel 2 Fig 1. " Standard " two-lane roundabout and key terms Abstract. Multi-lane roundabouts present motorists with a complex set of decisions. Unlike single-lane roundabouts, for which the only rule on entry is " yield to the driver on your left, then circulate to your right " , multi-lane roundabouts also require decisions about lane positioning – and these decisions are necessary at multi...

Uncoordinated traffic flows at the traditional roundabouts, especially with a small circumference and fewer lanes, are often heavily affected by congestion, which escalates fuel consumption, CO2 emissions, idling, travel delay. An intriguing way to mitigate such uncoordinated junctions would be facilitated through optimal signalization. For this purpose, paper presents novel holistic Three-Leg ...

way. Vehicles entering the roundabout must yield cautiously to ones already navigating the circulatory lane(s). The far-reaching appeal of roundabouts can be specifically ascribed to their substantiated safety benefits, strengthened circulation efficiency, decreased maintenance costs, and improved aesthetic effects (1). France, leading the world with roughly 15,000 modern roundabouts, has been ...

While roundabouts are still fairly new in the U.S. and Wisconsin, their safety benefits have been studied with varied results. For this study, researchers analyzed 24 Wisconsin roundabouts that were built in 2007 or before. Three years of before and after crash data were gathered as well as geometric and volume data. An Empirical Bayes (EB) analysis was used to examine the safety benefits for t...

In this paper, we propose a new model to study traffic flow at a single-lane urban roundabout, using a multi-state cellular automata (CA) ring under the offside-priority rule (by which a vehicle entering gives way to one already on the roundabout). Each vehicle entering the roundabout is randomly characterized by a predetermined exit with specified probability. Driver behavior at the roundabout...

The problem of minor vehicles crossing or merging into the major stream at unsignalized priority-controlled intersections is well-known. Numerous solutions involve various assumptions concerning the major headway distributions, number of major lanes, critical gap distributions, etc. Such cases can be divided into two main groups: intersections with two streams (one major and one minor stream) a...

The turbo-roundabout concept has recently emerged in the Netherlands as a viable alternative to conventional multilane roundabouts, aiming to solve a set of functional problems related to the weaving maneuvers in the entry and negotiation zones. Although this is a recent concept, the Dutch experience has been showing that it is an extremely efficient solution, mainly in terms of safety. In fact...

The main purpose of this study was to identify and analyze the prevailing types accidents at roundabouts. relationship revealed between certain accidents, place their occurrence, configuration roundabout. analyzed 321 19 ring intersections. Four predominant crash were identified: rear-end collision, collision with vulnerable road users, side swipe entering circulate collision. greatest number o...

Connected and automated vehicles (CAVs) are expected to transform future transportation systems. Over time, these might enhance traffic efficiency safety, especially at urban intersections. Therefore, it is essential make adaptations the analysis models that currently designed for human-driven only. This paper aims assess impact of CAVs on entry capacity roundabouts develop an approach adjust v...