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.

Analysis of dynamic transit through roundabout

Dynamický průjezd okružní křižovatkou je podle USA standardů jeden z parametrů, kterým se prokazuje správnost jejího návrhu. Dle českých předpisů stačí pouze návrh okružní křižovatky ověřit na prostorovou průjezdnost požadovaným návrhovým vozidlem. Ovšem otázkou zůstává, zda je pouze ověření prostorové průjezdnosti při stále zvyšujících se intenzitách provozu dostačující [1]. Tento článek se věnuje právě analýze dynamického průjezdu okružní křižovatkou. Řešena je rychlost průjezdu okružní křižovatkou v závislosti na poloměru v charakteristických bodech okružní křižovatky. Měření in situ probíhala na vybrané jednopruhové čtyřramenné okružní křižovatce. Cílem této práce je posoudit vybranou okružní křižovatku z hlediska dynamiky průjezdu a následně zjistit, jakou měrou odpovídá reálný dynamický průjezd teoretickému dynamickému průjezdu.Dynamic transit through roundabout is according to U.S. standards one of the parameters used to prove the validity of roundabout design. Under Czech law is roundabout design verification based on possibility of transit through the roundabout of design vehicle. But the question is whether the only a verification is enough especially if traffic is increasing [1]. The article is devoted to the analysis of dynamic transit through roundabout. Article dealt with the velocity of transit through roundabout, depending on the radius of the characteristic roundabouts points. In situ measurements were made on selected one-lane, four-arm roundabout. The aim of this work is to evaluate selected roundabout in terms of the dynamics transit and then find out how much corresponds theoretical dynamic transit to the real one

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

Drivers’ Response to In-Vehicle Route Guidance Information Systems: An Experiemnt with a Mock-Up Guidance System.

The paper reports an exploratory study, using an unusual technique to investigate drivers' response to in-vehicle route guidance information systems. Eighteen drivers were recruited, and asked to make a series of three trips in an unfamiliar area. Each driver was given turning advice, via a speech synthesiser, on one of these trips. This advice was based on average traffic conditions for the time of day. Unbeknown to the drivers, the advice was in fact triggered by the experimenter, who was riding as a back-seat passenger. Details were kept of times and routes taken with and without guidance, and with different levels of network familiarity. Records were also kept (using questionnaires and video and audio recording) of planning and route-following strategies. As expected, both receipt of guidance and even very rudimentary network familiarity resulted in reduced journey times, and routes closer to the guidance recommendations. The study indicated that factors including the directness of possible routes, their perceived complexity, and familiarity all affect route choice, but to different extents for different individuals and under different circumstances. Error was shown to be important in determining the route actually followed when guidance was withheld. The study showed that giving in-vehicle guidance using the mock-up technique described is practicable, and does influence drivers' route-choice and route-following behaviour. A possible future study is outlined, aimed at identifying the determinants of the drivers' level of compliance with advice when they believe that advice is based on real-time traffic information

Use of Kriging Technique to Study Roundabout Performance

Road intersections are dangerous places because of the many conflicting points between motorized and nonmotorized vehicles. In the case of defined traffic volume, several research groups have proved that roundabouts reduced the number of injuries and fatal accident cases. In recent years, many countries have adopted roundabouts as a standard design solution for both urban and rural roads. Several recent studies have investigated the performance of roundabouts, including some with models that calculated the entering flow (Q sub e) as a function of the circulating flow (Q sub c). Most existing models have been constructed with the use of linear or exponential statistical regression. The interpolative techniques in classical statistics are based on the use of canonical forms (linear or polynomial) that completely ignore the correlation law between collected data. As such, the determined interpolation stems from the assumption that the data represent a random sample. In the research reported in this paper, a geostatistical approach was considered: the relationship Q sub e versus Q sub c is supposed to be a regionalized phenomenon. According to that supposition, collected data do not represent a random sample of values but are supposed to be related to each other with a defined law. This recognition allows the realization of interpolation on the basis of the real law of the phenomenon. This paper discusses the fundamental theories, the applied operating procedures, and the first results obtained in modeling the Q sub e versus Q sub c relationship with the application of geostatistics