The use of logistics principles in the organization of local work

In the context of growing competition between rail transport and other transport types, there is a need to improve the transportation process. In modern conditions, railway transport is the main link in the logistics chain of moving goods from the shipper to the receiver. The efficiency of the railway transport complex can be improved by using logistics principles in the organization of local work on the network sections. In this study, we suggest ways to solve the problem of improving the quality of service for freight owners and the efficiency of organizing local work, which is relevant for railways. To make decisions aimed at improving the efficiency of the organization of local work, a procedure for determining the costs of organizing and promoting local trains was developed, taking into account the costs on maintaining the railway infrastructure. Not only the operational activity of the railways, but also the quality of transport customers service, compliance with the regulatory deadlines for cargo delivery, depends on the choice of the optimal option for organizing local car traffic into trains and their promotion along the section. The option is selected by comparing the costs for each of the possible options for organizing local car traffic into trains and moving them along the section.

FEATURES OF CALCULATION OF THE REQUIRED QUANTITY OF GRAIN TERMINAL TRACKS IN SEA PORTS IN MODERN CONDITIONS

Purpose. Ukraine is one of the world's five largest producers of grain crops. Much of the grain is exported. Traditionally, grain cargoes are exported through the western land crossings and seaports of the Black and Azov Seas, with the bulk of grain exports going through the port of Nikolaev and the ports of Greater Odessa. Rail transport provides delivery to exporting ports up to 2/3 of the total volume of grain transshipment in ports. Given the significant number of operations in the general technological process of processing grain wagons in ports, the required capacity of technical equipment of railway transport (number of tracks, locomotives, weighing devices, etc.) plays a significant role in the duration of the transshipment process and total operating costs. In this regard, determining the required number of ways to service the flow of grain for export is an urgent task. Methods. Comprehensive analysis of technical equipment and technology of railway transport of grain terminals in seaports, statistical analysis, graph-analytical modeling. Results. Based on the processing of statistics on the delay of wagons due to commercial marriages with grain cargo in the seaport, the conditional division of detained wagons due to and, consequently, the duration of delay of wagons into long and short. The characteristics of random values of the delay of the car are established and the dependence of the number of detained cars on the value of the total car traffic with grain cargo entering the transshipment is obtained. For short-term delays it is a polynomial dependence of the second degree, for long-term delays it is characterized by exponential dependence. Based on research, an additional track capacity has been established for the sedimentation of detained cars and recommendations have been developed for the number of such tracks and their length. Based on the rationing of the duration of shunting operations with delayed wagons, an additional working fleet of shunting locomotives for servicing delayed wagons was determined and recommendations for the location of wagon scales for commercial weighing of wagons in the process of processing grain wagons in the port. Practical significance. The obtained results can be used to determine the number of tracks and the total capacity of grain terminals in seaports. The duration of additional shunting operations to service the detained cars allows to clarify the calculation of the required locomotive fleet of grain terminals.

Car-Access Attractiveness of Urban Districts Regarding Shopping and Working Trips for Usage in E-Mobility Traffic Simulations

With the continuous proliferation of private battery electric vehicles, the demand for electrical energy and power is constantly increasing. As a result, the electrical grid may need to be expanded. To plan for such expansion, information about the spatial distribution of the energy demand is necessary. This can be determined from e-mobility traffic simulations, where travel schedules of individuals are combined with an attractiveness rating of locations to estimate traffic flows. Typically, attractiveness is determined from the “size” of locations (e.g., number of employees or sales area), which is applicable when all modes of transportation are considered. This approach leads to inaccuracies for the estimation of car traffic flows, since the parking situation is neglected. To overcome these inaccuracies and fill this research gap, we have developed a method to determine the car-access attractiveness of districts for shopping and working trips. Our method consists of two steps. First, we determine the car-access attractiveness of buildings within a district based on the parking situation of each individual building and then aggregate the results at the district level. The approach is demonstrated for the city of Berlin. The results confirm that conventional models cannot be used to determine the car-access attractiveness of districts. According to these models, attractive districts are predominantly located in the city centre due to the large amount of sales areas or the large number of employees. However, due to the high density of buildings, only limited space is available for parking. Attractive districts rated according to our new approach are mainly located in the outer areas of the city and thus match the parking situation.

Mobilność w centrum średniego miasta w perspektywie możliwości wprowadzenia strefy płatnego parkowania – studium przypadku Tczewa

Polityka parkingowa należy do ważniejszych wyzwań w rozwoju współczesnych miast w zakresie transportu. Jednym z narzędzi kształtowania tego zjawiska w miastach jest wprowadzanie stref płatnego parkowania, które mają zwiększać rotację pojazdów oraz zachęcać do korzystania z innych środków transportu w codziennych dojazdach. Jest to szczególnie ważne w kontekście centrów miast. Wdrażanie stref płatnego parkowania stanowi często stosowane rozwiązanie w dużych miastach, rzadziej w średnich i małych. Celem tego badania jest analiza sposobu docierania mieszkańców średniego miasta – Tczewa – do centrum (Starego Miasta) oraz ocena możliwości wprowadzenia strefy płatnego parkowania. Badanie przeprowadzono metodą ankiety, posługując się techniką PAPI (Paper and Pencil Interview), w którym zebrano 375 odpowiedzi. W przeprowadzonym badaniu ankietowym wykazano, że istnieje duży poziom akceptacji społecznej dla możliwości wprowadzenia strefy płatnego parkowania w analizowanym przypadku. W badaniu wykazano ponadto, że znaczną większość użytkowników centrum stanowią osoby docierające tam pieszo. Potwierdzono także, że mieszkańcy są skłonni nie tylko zapłacić za parkowanie w centrum miasta, ale także przejść pewien dystans pieszo od miejsca postojowego do celu podróży. Niniejsza praca może mieć charakter aplikacyjny i stanowić wskazówkę dla innych miast o podobnej wielkości i strukturze, które zamierzają wprowadzić strefę płatnego parkowania lub innego rodzaju ograniczenia ruchu samochodów. Mobility in the centre of a medium-sized city in the perspective of the prospective introduction of a paid parking zone – a case study of Tczew Parking policy is one of the more important challenges in the development of modern cities in terms of transport. One of the tools for shaping this policy in cities is the introduction of paid parking zones, which are intended to increase vehicle turnover and encourage the use of other means of transport for everyday commuting. This is particularly important in the context of city centres. The introduction of paid parking zones is a common solution in large cities, less so in medium-sized and small ones. The aim of this study is to analyse how residents of a medium-sized city – Tczew – travel to the centre (Old Town) and to assess the possibility of introducing a paid parking zone. The study was carried out through a survey, using the PAPI (Paper and Pencil Interview) technique, with 375 responses collected. It showed that there is a high level of public acceptance for the possible introduction of a paid parking zone in the case under consideration. The study also yielded that the vast majority of users of the centre are people who get there on foot. It was also confirmed that residents are not only willing to pay for parking in the city centre, but also to walk a certain distance from their parking space to their destination. This work can be applied as a guide to other cities of similar size and structure that intend to introduce paid parking zones or other types of car traffic restrictions.

Improvement of the planning method of the sortation system

Objective: Determination of the minimum time spent by a transit car with processing at the marshalling yard, identification of the optimal car flow in order to optimize the loading of the station’s technical devices. Methods: The description of interoperational downtime is carried out by the theory of queuing, simulation modeling is used to recreate technological processes at the marshalling yard. Results: As a result of the analysis of the average time spent by the car at the station, a model of the marshalling yard was built, taking into account the monthly irregularity of the flow of the processed flow. Practical importance: With the help of the obtained data, it is possible to improve the long-term planning of the work of the sortation system, to determine the optimal load of the station’s technical means. By changing the station’s constant parameters (the number of tracks) and variables (the number of maintenance crews, the number of shunting locomotives), it is possible to respond flexibly to the required development of the car traffic made by the station.

Bicycle Traffic Model for Sustainable Urban Mobility Planning

Modelling tools and transport models are required to assess the impact of measures for the effective planning of cycling routes in cities. This paper presents the methodology for developing a four-stage macroscopic model of bicycle traffic for the city of Gdynia, and its use in planning new bicycle routes, considering a modal shift. The model presented in this paper allows for the evaluation of the influence of the characteristics of the cycling infrastructure, along with the development of the cycling network based on the choice of cycling as an alternative to other modes of transport, by taking into account the modal shift. The model takes into account the influence of the longitudinal gradient, link, and surface type of cycling routes on the distribution and demand for bicycle traffic. The results of our research allow us to assess the impact of planned cycling routes on the reduction in the volume of car traffic, which is crucial for reducing energy consumption and negative environmental impacts. Experiences from the application of the model in Gdynia suggest that the model provides a strong basis to support mobility planning and monitoring processes in cities worldwide. Cities should take into account the methods proposed in this paper when planning the development of their transport systems.

Capacity Gains of Splitting Cross-Traffic into Multiple Sub-Streams

Traffic flow might be limited by cross-traffic which has priority. A typical example of such a situation is a location where cyclists or pedestrians cross a stream of car traffic. Splitting the cross-traffic into two separate sub-streams (for instance left–right and right–left) can increase the capacity of the main stream. This is because it is no longer necessary to have a sufficiently large gap in both sub-streams simultaneously. This paper introduces a method to compute the resulting capacity of roads with cross-traffic. Without loss of generality, we introduce three transformations to simplify computations. These transformations are an important contribution of the paper, allowing us to create scalable graphs for capacity. Overall, the research shows that splitting a crossing stream into two equally large sub-streams increases the capacity of the main stream. If there is place for one vehicle in between two sub-streams, the capacity can increase up to threefold. Even larger gains are possible with more vehicles in between. This paper presents graphs which can be used to find the capacity for generic situations, and can be used for developing guidelines on intersection design.

Syncing sustainable urban mobility with public transit policy trends based on global data analysis

Unforeseeable developments will accompany progressive COVID-19 recovery globally. Similarly, science will inform changes amidst its own progress. Social isolation and distancing imposed by the pandemic are likely to result in changed habits, behavior, and thinking paradigms. Inevitably, this should affect the tremendous confusion inhibiting automated urban mobility's evolution. While mobility often seems magnanimously resistant to change, using international data, this analysis shows road traffic, the largest net contributor to global warming, is responsible for even greater damages. The core claim justifies replacing private cars (PCs) by existing and future public transit (PT) vehicles. In testing 17 major cities globally, 94% of the scenarios proved PT superior or equivalent to PCs for reducing travel time. As a result, a foreseeable, future scenario shows potential reduction in car traffic by approximately two-thirds compared with the current situation. In two arenas, proactive government can promote such sustainable urban mobility: (1) developing autonomous vehicles for PT only; (2) coordinating standardization for seamless urban mobility. These global decisions for improving our lives in the future are likely to be better received and understood subsequent to COVID-19, as the focus of our concerns changes from what preoccupied us under the circumstances prior to the pandemic.