Safety effectiveness of converting signalized intersections to roundabouts

Groß, Frank; Lyon, Craig; Persaud, Bhagwant; Srinivasan, Raghavan

doi:10.1016/j.aap.2012.04.012

Cited by 87 publications

(43 citation statements)

References 2 publications

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“…The EB method has a number of advantages such as that it properly accounts for regression-to-the-mean, overcomes the difficulties of using crash rates in normalizing for volume differences between the before and after periods, and provides bigger reliability in effect determination for the safety, especially when grouping of different intersections according to certain criteria [1]. There is general consensus among researchers and practitioners regarding the superiority of EB technique, and it is recommended for use in all circumstances where the data and required SPFs are available [31].…”

Section: Discussionmentioning

confidence: 99%

“…So, instead of that, π is estimated by using EB procedure where Safety Performance Function (SPF) is used for estimation of the number of crashes at intersections similar to those which are being analyzed P [1]. These control intersections are similar to the analyzed ones in terms of similar geometry (Table 3), often with the same main road, and the same speed limit -50 km/h.…”

Section: Methodsmentioning

confidence: 99%

“…Here, research results on the safety effectiveness of roundabouts are presented based on the example of 15 two-lane entry/exit intersections in the city of Niš. All converted intersections were two-lane so it was impossible to question the effectiveness of conversion for one-lane intersections, at which as shown in many studies, the conversion has better effects in terms of decreasing the crash number [12,1]. In general, double-lane roundabouts have some of the same safety performance characteristics as their simpler single-lane counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…Intersections safety is a serious safety concern worldwide [1]. Serbia is also in a similar predicament, where 7,050 crashes happened at intersections in urban areas, and where there were 54 fatalities, and 4,024 slightly or severely injured in 2012 [2].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Safety Effectiveness of Converting Conventional Intersections to Roundabouts: Case Study in the City of Niš

Vujanic

Savićević

Antić

et al. 2016

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Safety Effectiveness of Converting Conventional Intersections to Roundabouts: Case Study in the City of Niš

Vujanic

Savićević

Antić

et al. 2016

PROMET

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“…Modern roundabouts are mainly characterized by yield-at-entry, one way traffic flow, path deflection and entry flare (FOULADVAND; SADJADI; SHAEBANI, 2004). They can be seen as an alternative to common intersection regarding safety effectiveness (PERSAUD et al, 2001;GROSS et al, 2013). Besides that, the United States Department of Transportation 1 describes other benefits such as operation performance, traffic calm, access management and pedestrian safety.…”

Section: Dynamic Pathsmentioning

confidence: 99%

Piecewise linear continuous-curvature path planning for autonomous vehicles

Silva¹

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2018Trata-se da versão corrigida da dissertação. A versão original se encontra disponível na EESC/USP que aloja o Programa de Pós-Graduação de Engenharia Elétrica. Autonomous vehicles have increasingly become an attractive field due its promising capabilities of improvements regarding safety, comfort, traffic flow etc. A required attribute for those vehicles is the ability of autonomously compute its path towards a destination point. The path must be planned considering the constructive aspects of the vehicle in order to guarantee the maneuver feasibility. This work consists on computing a feasible path for autonomous vehicles with non-holonomic constraints. Piecewise linear continuouscurvature paths constituted of clothoids, circular arcs, and straight lines are used for this purpose, providing passenger's comfort. The road network is modeled from GPS (Global Positioning System) vehicle trajectories by defining lanes, roundabouts and intersections. GPS points are used later to parameterize lanes using clothoids and to extract roundabout centers and radii. This approach provides a sparse road network model since GPS points are replaced by parameterized curves. The information about connections between roads coming from the model is used by a global path planner, which computes a minimal length route from the vehicle current position to the destination point. After that, path planners compute intersection and roundabout paths depending on the nature of connections between roads. Also, lanes changes are performed to obey traffic rules. These three path planners that connects adjacent roads use clothoids, circular arc, and straight lines as interpolating curves whose curvature is constrained to that the vehicle can perform: the intersection path planner uses only a minimal amount of steering to perform the maneuver, increasing the comfort level; the roundabout path planner takes the roundabout center and radius as well as parameters that defines the entrance and exit maneuvers to compute the path; the lane change path planner connects lanes belonging to the same road with a prescribed longitudinal traveled distance depending on whether this maneuver is required. In the end, an global continuous-curvature path is generated. As the result of this work, a real urban scenario is modeled and the proposed approaches are validated. Veículos autônomos têm cada vez mais se tornado um campo atraente de pesquisa devido às suas capacidades promissoras de melhorias em segurança, conforto, fluxo de tráfego, etc. Um atributo necessário para esses veículos é a capacidade de calcular, de forma autônoma, o seu caminho para um ponto de destino. O percurso deve ser planejado considerando os aspectos construtivos do veículo para que a viabilidade das manobras a serem executadas seja garantida. Este trabalho consiste no planejamento de trajetória para veículos autônomos com restrições não-holonômicas. Utilizam-se, para esse efeito, trajetórias cuja curvatura seja contínua e linear por partes, constituídas por clotóides, arcos de circun...

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