This study evaluates the impact of pedestrian flow through vehicular delays in a proposed DLT intersection located in an urban area with a high vehicular and pedestrian traffic volume. In addition, it evaluates the pedestrian–vehicle conflict points, the effect on the other accesses after the implementation of the displaced left turns, and the consequences of reorganizing pedestrian flow. Three scenarios are evaluated through microsimulation; the existing one, which is a conventional cross-shaped intersection; a proposed DLT intersection with two displaced left turns on adjacent accesses; and a third one, similar to the last one, but with the inclusion of a pedestrian underpass. Results indicate that a proposed conventional DLT increases the vehicle delays of the intersection by 6.0% compared to the existing condition, mainly due to the high volume of pedestrians and the conflicts it generates. However, with the inclusion of a pedestrian underpass, vehicle delays are reduced significantly by up to 34.0%.

With the number of vehicles increasing in the system every day, many statewide policies across the United States aim to increase the use of non- motorized transportation modes. This could have safety implications because the interaction between motorists and non-motorists could increase and potentially increasing pedestrian-vehicle crashes. Few models that predict the number of pedestrian crashes are not sensitive to site-specific conditions or intersection designs that may influence pedestrian crashes. Moreover, traditional statistical modeling techniques rely extensively on the sparsely available pedestrian crash database. This study focused on overcoming these limitations by developing models that quantify potential interactions between pedestrians and vehicles at various intersection designs using as surrogate safety measure the time to conflict. Several variables that capture volumes, intersection geometry, and operational performance were evaluated for developing pedestrian-vehicle conflict models for different intersection designs. Linear regression models were found to be best fit and potential conflict models were developed for signalized, unsignalized and roundabout intersections. Volume transformations were applied to signalized and unsignalized conditions to develop statistical models for unconventional intersections. The pedestrian-vehicle conflicting volumes, the number of lanes that pedestrians are exposed to vehicles, the percentage of turning vehicles, and the intersection conflict location (major or minor approach) were found to be significant predictors for estimating pedestrian safety at signalized and unsignalized intersections. For roundabouts, the pedestrian-vehicle conflicting volumes, the number of lanes that pedestrians have to cross, and the intersection conflict location (major or minor approach) were found to be significant predictors. Signalized intersection models were used for bowtie and median U-turn intersections using appropriate volume transformations. The combination of signalized intersection models for the intersection area and two-way unsignalized intersection models for the ramp area of the jughandle intersections were utilized with appropriate volume transformations. These models can be used to compare alternative intersection designs and provide designers and planners with a surrogate measure of pedestrian safety level for each intersection design examined.

La presente investigación tuvo como prioridad resolver el problema de congestión vehicular en el cruce de la Panamericana Norte con la avenida Próceres de Huandoy, ubicado en el distrito de los Olivos, Lima, Perú. Para resolver los problemas que aquejan a los usuarios de la intersección mencionada anteriormente se propuso implementar una intersección innovadora llamada Giro a la Izquierda Desplazada (DLT). El estudio se realizó teniendo en cuenta los principios microscópicos de simulación con el programa Vissim; con el fin de evaluar a detalle el comportamiento vehicular y peatonal de manera independiente, ya que el comportamiento de uno influye en las acciones de los demás. La intersección estudiada posee grandes aforos vehiculares y peatonales, y la relación entre vehículo y peatón se encuentra latente, ya que interactúan en medio de la calzada. Para realizar el estudio, se requirió dos visitas a campo con el fin de obtener datos para, posteriormente, evaluar la situación del tránsito actual y proponer las mejoras que los aforos demanden. Asimismo, se buscó que la solución propuesta sea perdurable en el tiempo. Por tal motivo, se analizaron los escenarios con proyecciones a un horizonte de 15 años en el futuro. Los tiempos de viajes vehiculares y las velocidades peatonales fueron los parámetros que ayudaron a la investigación calibrar y validar el modelo para que, finalmente, se obtenga las demoras vehiculares y peatonales. / The present investigation had as a priority to solve the problem of vehicular congestion at the intersection of the Panamericana Norte with Próceres de Huandoy avenue, located in the Los Olivos district, Lima, Peru. To solve the problems afflicting the users of the intersection, it was proposed to implement an innovative intersection called Displaced Left Turn (DLT). The study was carried out considering the microscopic principles of simulation with the Vissim program; to evaluate in detail, the vehicular and pedestrian behavior independently. Since the behavior of one influence the actions of others. The intersection studied has large vehicular and pedestrian traffic, and the relationship between vehicle and pedestrian is latent since they interact in the middle of the road. To carry out the study, two field visits were required to obtain data to subsequently evaluate the current traffic situation and propose the improvements that the gauges demand. Likewise, it was sought that the proposed solution is lasting over time. For this reason, the scenarios with projections for a horizon of 15 years in the future were analysed. Vehicle travel times and pedestrian speeds were the parameters that helped the investigation calibrate and validate the model so that, finally, vehicular and pedestrian delays were obtained. / Tesis