Álamo Loyola, Alberto J.

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    Análisis del diseño geométrico detallado de una rotonda de carriles múltiples en Puerto Rico
    (2011) Álamo Loyola, Alberto J.; Figueroa-Medina, Alberto M.; College of Engineering; Valdés Díaz, Didier M.; Colucci Ríos, Benjamín; Department of Civil Engineering; Bartolomei Suárez, Sonia M.
    Highway designers and transportation officials in Puerto Rico are beginning to consider the design and installation of modern roundabouts as an alternative to traditional at-grade intersections. The modern roundabout has its origins in the United Kingdom in the 60’s decade. The use of modern roundabouts was extended to other European countries and then to the United States during the 1990’s. The success of the modern roundabout is based on its safety performance. Studies show that modern round abouts reduce fatal accidents when compared with traditional intersections. The primary objective of this project is to perform an analysis of the geometric aspects used for the design of a two-lane modern roundabout located in the Municipality of Toa Alta, Puerto Rico. Project construction plans and field observations were used for the analysis of the geometric design. This project includes useful information about design aspects of modern roundabouts and a simplified methodology for the analysis of the geometric design that can be of interest to professionals involved in the planning, design, construction, and maintenance of the highway system. Geometrics aspects such as the angle between roundabout entries, the entry angle, the stopping sight distance and intersection sight distance are important parameters to check in the review. As part of this work, existing safety performance models were used in conjunction with the traffic conflict technique to study different types of accidents occurring in multi-lane roundabouts and their possible relation with geometric aspects. Through the development of a conflict-accident relationship at intersections, were 31,487 conflicts are equivalent to 1 accident, the primary types of accidents occurring at the multi-lane modern roundabout were estimated to identify potential safety issues. Entering-circulating conflicts show a higher frequency when compared with other types of conflicts occurring at this modern roundabout.