Transport Technologies

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    Analysis of saturation flow on isolated lanes of controlled intersections with significant traffic intensity
    (Видавництво Львівської політехніки, 2020-09-14) Murovanyi, Igor; Mazyliuk, Pavlo; Lutsk National Technical University
    The methods and results of the investigation of intervals between vehicles during queue dissipation before controlled intersections with the further determination of saturation flow are reviewed in this paper. Having reviewed existing methods of determining the saturation in traffic flows, those are determined which provide the most certain results in conditions of intensive movement and take into account quite a large number of impact factors. Such methods are based on experimental measurement of intervals between vehicles during their passage through the stop-line in different directions of the controlled intersection. For the completeness of the analysis of such intervals, such factors are considered additionally as traffic composition and use of lanes by directions. Objects of the research are controlled intersections on approaches to which the slope is absent, there is no pedestrian and cyclist movement during the performance of turn, and conflicting traffic flows and also public transport stops in the zone of the intersection. The transitional research result is the determination of the number of vehicles that pass the stop-line during the permissive signal and time intervals between them, and the final result is the oncoming of saturation period on the lanes of straight and turns movement depending on traffic flow composition.
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    To determination of traffic delay at controlled intersection
    (Видавництво Львівської політехніки, 2020-02-26) Fornalchyk, Yevhen; Hilevych, Volodymyr; Lviv Polytechnic National University
    Taking into account the importance of time spent on passing distances of vehicle routes that lie across city road network (RN), well-known approaches to the determination of vehicle delay in the movement process (waiting for passage and the passage) of controlled intersections are analyzed. Reasons that cause the growth of these delays and that have an impact on traffic light cycle duration are counted. At the same time, the authors justify the need for change in the existing term transport delay. It should be interpreted (concerning intersection passage) as a delay only in the case when the group of vehicles that have stopped before intersection could not pass this intersection during the permission signal and wait for the next such signal. If the vehicles in the first group could pass the intersection (possibly taking into account also waiting for the permission signal), then this is not a delay but the necessary component of the technological process of the route passage. From this point of view, an approach in the traffic delay determination method at controlled intersections is proposed taking into account the particular components of Webster`s formula and the volume-capacity ratio of RN that determine the motorization level of the city population. A comparison of the results of delay calculation, determined with the use of the proposed method and Webster’s formula, is carried out.
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    Increasing the complex intersections functioning efficiency by restriction of left-turn traffic flows
    (Видавництво Львівської політехніки, 2020-02-26) Lobashov, Oleksii; Boikiv, Mykola; O. M. Beketov National University of Urban Economy in Kharkiv; Lviv Polytechnic National University
    Providing rapid and safe traffic in cities requires the use of a set of planning and organizational measures. While the implementation of architectural-planning measures requires, except for significant investments, a quite long period, organizational measures can lead to a temporary but relatively rapid effect. For this purpose, an analysis of traffic flow metrics on the approaches to the intersection, traffic light cycle, and the traffic phasing is carried out. Conducted research indicates that left-turn flows cause significant delays and reduce traffic safety at the intersection. Therefore, increasing the efficiency of the crossroads needs redevelopment measures by restriction of the left-turn flows on the main road, change of the traffic flows phasing and optimizing the traffic light cycle. In the presence of adjacent intersections, the scheme of left turn realization is developed. The simulation of intersection functioning in existing conditions and under the change of left-turn flows movement organization is carried out in the PTV Vissim software environment. It is established that restriction of the left-turn flows at the controlled intersection allows to optimize the traffic light cycle and equip it so that the average delay for traffic flows will decrease in comparison with the current state.