The Silhavy Corridor Improvement Project

The City of Valparaiso, Indiana is considering various alternatives to improve safety and efficiency at the existing signalized intersection at Silhavy Road and LaPorte Avenue. One of these alternatives is to construct a multi-lane roundabout. However, a large amount of space is required for the construction of a multi-lane roundabout. In an already heavily developed area, space is a major constraint. The city is also proposing improvements along Silhavy Road north and south of the intersection to enhance traffic flow in the area. The first goal of this research project was to determine if an appropriately sized roundabout would fit into the available space. The second objective was to study improvements in traffic conditions in the area due to the proposed roundabout at Silhavy Road and LaPorte Avenue and capacity enhancement measures along the Silhavy Road corridor. A two-lane roundabout that will fit into the available space and handle the traffic demand was designed. Using traffic simulation software, the delay was measured for both the current signalized intersection and for the proposed two-lane roundabout. The results showed a significant reduction in delay at the intersection due to the roundabout. This benefit is in addition to the safer conditions of a roundabout over a signalized intersection

Design of roundabout in Horsens (Denmark) and comparison of Danish and Czech approach to design

Cílem této bakalářské práce je návrh okružní křižovatky v Dánsku ve spolupráci s dánskou univerzitou VIA University College v Horsens a porovnání různých přístupů k řešení jednotlivých prvků okružních křižovatek v České republice a Dánsku. První část práce se zabývá vlastním návrhem okružní křižovatky a je zpracována vesměs v angličtině. Výkresová dokumentace je dvoujazyčná a je doplněna technickou zprávou v češtině. Druhou část práce tvoří porovnání dánského a českého přístupu k návrhu okružních křižovatek a zaobírá se nejdůležitějšími rozdíly které byly zjištěny při vytváření projektu.The aim of this bachelor's thesis is design of roundabout in Denmark in cooperation with Danish university VIA University College in Horsens and comparison of different approaches to designing specific project solutions for roundabouts in Czech republic and Denmark. The first part of thesis is dealing with whole roundabout design and is made generally in English. All drawings are bilingual with added technical report in Czech. The second part of thesis consist of comparison of Danish and Czech approach to roundabout design and is dealing with the most important differences which were found during project.

Characteristics of Vehicular Traffic Flow at a Roundabout

We construct a stochastic cellular automata model for the description of vehicular traffic at a roundabout designed at the intersection of two perpendicular streets. The vehicular traffic is controlled by a self-organized scheme in which traffic lights are absent. This controlling method incorporates a yield-at-entry strategy for the approaching vehicles to the circulating traffic flow in the roundabout. Vehicular dynamics is simulated within the framework of the probabilistic cellular automata and the delay experienced by the traffic at each individual street is evaluated for specified time intervals. We discuss the impact of the geometrical properties of the roundabout on the total delay. We compare our results with traffic-light signalisation schemes, and obtain the critical traffic volume over which the intersection is optimally controlled through traffic light signalisation schemes.Comment: 10 pages, 17 eps figures. arXiv admin note: text overlap with arXiv:cond-mat/040107

Experimental Validation of a Real-Time Optimal Controller for Coordination of CAVs in a Multi-Lane Roundabout

Roundabouts in conjunction with other traffic scenarios, e.g., intersections, merging roadways, speed reduction zones, can induce congestion in a transportation network due to driver responses to various disturbances. Research efforts have shown that smoothing traffic flow and eliminating stop-and-go driving can both improve fuel efficiency of the vehicles and the throughput of a roundabout. In this paper, we validate an optimal control framework developed earlier in a multi-lane roundabout scenario using the University of Delaware's scaled smart city (UDSSC). We first provide conditions where the solution is optimal. Then, we demonstrate the feasibility of the solution using experiments at UDSSC, and show that the optimal solution completely eliminates stop-and-go driving while preserving safety.Comment: 6 Pages, 4 Figures, 1 tabl

Development of weaving section flow model of conventional roundabout / Jezan Md Diah

Roundabout has been used and becomes popular in sub-urban residential areas as one of a viable traffic control system at intersections. At roundabout vehicles need to make a circulatory movement before exiting to their respective directions without having to stop, thus minimize delay. Studies on roundabout capacity and performance mostly focus on geometric configuration and flow at the entry, on the basis and acceptance of offside priority rule. Studies had shown that offside priority is most appropriate and efficient with small and mini roundabout. As for conventional roundabout or those with inscribe diameter DI > 50 m, the approach may give rise to differences in predicted capacities

Gradient-based Instantaneous Traffic Flow Optimization on a Roundabout

In this article we focus on instantaneous traffic fl ow optimization on a roundabout using a macroscopic approach. The roundabout is modeled as a concatenation of 2x2 junctions with one main lane and secondary incoming and outgoing roads. We consider a cost functional that measures the total travel time spent by drivers on the roundabout and compute its gradient with respect to the priority parameters at junctions. Then, through numerical simulations, the traffic behavior is studied on the whole roundabout. The numerical approximations compare the performance of a roundabout for instantaneous optimization of the priority parameters and fixed constant parameters