ANALISIS NILAI KEPADATAN LAPANGAN DENGAN SAND CONE TEST (STUDI KASUS: JALAN YOS SUDARSO KOTA PALANGKA RAYA)

Soil compaction is required so that the embankment is strong and balanced with structural and non-structural loads. One of the efforts to handle soil with low bearing capacity is to change the subgrade using soil that is considered good. Therefore, an attempt was made to estimate the density of the soil in the field by conducting a sand cone test on the selected embankment material on the Yos Sudarso road work, Palangka Raya City. The sample used in this study came from Hampangen Village, Kasongan Baru Village, Katingan Hilir District, Katingan Regency, Central Kalimantan Province. The results of tests carried out on laboratory density testing and sand cone testing on Yos Sudarso Street, Palangka Raya City can be ascertained that the density obtained from dry soil density γdry = 1.29 g/cm3, maximum dry density γd lab = 1.35 g/cm3 γdr / γd lab x100 = Dr. So the approved density is Dr = 95.86%.

Respiratory Hospitalizations and Their Relationship with Air Pollution Sources in the Period of FIFA World Cup and Olympic Games in Rio de Janeiro, Brazil

Background: From 2010 onwards, the city of Rio de Janeiro has undergone changes related to the 2014 FIFA World Cup and the 2016 Olympic Games, potentially affecting the respiratory health of inhabitants. Thus, the spatial distribution of respiratory hospitalizations (2008–2017) and the relationship between this outcome and potential air pollution sources in the city of Rio de Janeiro (2013–2017) were evaluated. Methods: An ecological study was performed using the Bayesian model with multivariate Poisson regression for the period of the sporting events (2013–2017). The outcome was the ratio of hospitalizations for respiratory diseases by the population at risk. Data analysis was performed in the total population and by sex and age group. The air pollution-related variables included industrial districts, traffic density, tunnel portals, a seaport, airports, and construction/road work. Results: All explanatory variables, except tunnel portals, were associated with an increase in the outcome. Construction/road work showed a greater magnitude of association than the other pollution-related variables. Airports were associated with an increased hospitalization ratio among the ≥60 year-old group (mean = 2.46, 95% credible intervals = 1.35–4.46). Conclusion: This study allows for a better understanding of the geographical distribution of respiratory problems in the city of Rio de Janeiro. Present results may contribute to improved healthcare planning and raise hypotheses concerning exposure to air pollution and respiratory hospitalizations.

Provisional COVID-19 infrastructure induces large, rapid increases in cycling

The bicycle is a low-cost means of transport linked to low risk of transmission of infectious disease. During the COVID-19 crisis, governments have therefore incentivized cycling by provisionally redistributing street space. We evaluate the impact of this new bicycle infrastructure on cycling traffic using a generalized difference in differences design. We scrape daily bicycle counts from 736 bicycle counters in 106 European cities. We combine these with data on announced and completed pop-up bike lane road work projects. Within 4 mo, an average of 11.5 km of provisional pop-up bike lanes have been built per city and the policy has increased cycling between 11 and 48% on average. We calculate that the new infrastructure will generate between $1 and $7 billion in health benefits per year if cycling habits are sticky.

Review of recent developments on improvement of estimated regulatory documentation for road works

Introduction. In the modern conditions of the pricing system in the construction of Ukraine, the key value have the estimated norms, which are presented in separate collections, the main purpose of which is to determine the standard quantity of resources required to perform a particular type of work as a basis for the transition to the cost indicators. In order to determine the cost of road work objectively and accurately, it is essential that the indicators of estimated norms meet the requirements of regulatory documents and modern methods of execution of road works.Problematics. In connection with the active improvement of the regulatory base of the road construction industry, permanent upgrade of road organizations technique fleet, the introduction of new technologies and materials in construction and operation of roads, improving the methods of work there is a discrepancy between the existing resource element of estimated norms and the actual conditions of work in terms of built-up labor costs, the operation time of machines and mechanisms and the range of materials. Accordingly, it affects the reliability and accuracy of determining the cost of road works.Purpose. Improvement and harmonization with actual working conditions and requirements of regulatory documents of industry regulatory and estimate base of resource elementary estimated norms for work performed during construction, reconstruction, repair and operational maintenance of roads and bridges to ensure reliable and valid technical, economic and estimated calculations.Materials and methods. During work performance the analysis of the regulatory documentation, establishing the requirements to the technology of road works and materials has been carried out. A number of chronometric observations with the measurement of time of road works in full-scale conditions was carried out. The obtained data were summarized, averaged and on their basis the indicators of the resource element of the estimated norms were estimated.Results. A review of the main amendments and additions, which came into force after the approval of Amendment No 2 SOU 42.1-37641918-035:2018 [1] and Amendment No 2 SOU 42.1-37641918-071:2018 [2], which were developed to improve the regulatory-estimate base for the calculation of road works, taking into account the requirements and provisions of existing regulatory documents taking into account the current state of scientific and technological progress in the road sector.Conclusions. The above analysis of the amendments that came into force with the approval of [1]. and [2] will systematize the innovations provided by the requirements of current regulatory documents on the calculation of the cost of road works and the development of relevant documents at all stages of the investment process, planning and organization of road works, as well as the writing-off of material resources. Review and systematization of recent improvements in the estimated regulatory documents for road works will provide an opportunity to optimally plan the use of available material, labor and financial resources, often limited.Keywords: public road, operational maintenance, investment documentation, overhaul and current repairs, machine, mechanism, regulatory document, resource element estimate norm, Standard of Organization of Ukraine.

Detecting Risk Factors of Road Work Zone Crashes from the Information Provided in Police Crash Reports: The Case Study of Portugal

Several studies have shown that European police crash reports provide different detail degrees of work zone crash-related data. In this sense, the present study aims to verify the possibility of identifying significant risk factors involved in the occurrence of road work zone crashes with casualties, based on the official data usually available, through a descriptive, binary logistic, and probit regression statistical analysis. To accomplish the analysis, a total of 2597 police-reports related to 1767 Portuguese work zone crashes that occurred during the 2013–2015 period were considered and binary logistic and probit regression models were estimated by the main type of crash, contributing factor, and driver age group. Fifteen explanatory variables, selected based on the literature review and crash data provided in police crash reports, were considered in the analysis. The results obtained for the estimated coefficients and goodness-of-fit test values were found very similar for both link functions (logit and probit) and it was possible to identify risk factors. The modeling results pointed to excessive speed, disregard for vertical signs, luminosity, intersections, and motorcycle and heavy vehicle involvement as the most significant risk factors. Given the results, it is possible to conclude that binary logistic regression can be used in the statistical analysis of the available police official work zone crash data to identify and get some insight into the risk factors involved in work zone crashes. Data analysis also revealed the need to promote adequate and complete crash report filling by police officers. While police crash reports are not revised and standardized to incorporate more detailed work zone crash information, this approach can be used to support a more efficient road operation decision making and the review of some aspects related to work zone layout design.

IMPROVING ROAD MAINTENANCE MANAGEMENT PRACTICES IN RUSSIA

The level of transport infrastructure development is one of the key determinants of economic growth. In 2018, 67.1% of all transported goods in Russia were delivered via road transport. However, Russia’s motor transport system has yet to come close to fulfilling its full potential – 57.6% of public roads do not meet regulatory maintenance requirements. The prevailing statistics highlights the task of ensuring the safety of roads. This issue is especially relevant during winter months, when the roads experience maximum climatic and physico-chemical effects. This article analyzes the road safety system of the constituent entities of the Russian Federation, considers the main regulatory documents governing the activities of road work suppliers and executive authorities in the field of road maintenance. The authors analyzed the best foreign practices in road maintenance policy. The main result of the study is the proposal to introduce a mechanism for servicing roads using a performance based contract to replace to cost based road maintenance contracts, which are the most widely applied in Russia.

Improving state policy in the field of safety and road maintenance in the constituent entities of the Russian Federation

The level of transport infrastructure development directly affects the rate of economic growth. In 2018, in Russia, 67.1 % of the total volume of transported goods were delivered by road transport. However, we cannot talk about the full realization of the road transportation system since 57.6 % of public roads do not meet regulatory requirements. The available statistics indicate that, first of all, attention should be paid to the condition of the roads. The article analyzes the system for road maintenance in the constituent entities of the Russian Federation, considers the main regulatory documents governing the activities of road work suppliers and executive authorities in the field of road maintenance. The article examines and analyzes the advanced foreign experience in the field of technologies for servicing roads in the winter. As the result of analysis, the authors propose introducing performance-based contracts into the field of the road sector. The creation of an economically feasible form of performance-based contracts can lead to a decrease in the cost of road maintenance by 10-40 %.

Studi Perencanaan Campuran Latasir (Lapisan Tipis Aspal Pasir) Pada Pekerjaan Peningkatan Jalan Desa Terpencil Di Kabupaten Tapin

Candi Laras Utara sub-district, includes swampy lowlands, are very difficult to reach by using a 4-wheeled vehicle because the conditions of the roads are not standard or in narrow terms and the traffic volume can be said to be very low because it is only passed by 2-wheeled vehicles, the alternative is to use a Latasir pavement layer as a surface layer, there are 3 problems that must be examined, including how to plan the composition of the Latasir-forming material mixture, and how to transport the material to the road work location. and how to process the Latasir material, method The logic of this research is an experimental method, namely the processing of test objects in the form of samples of various variations in the form of surface or road surface layers, but previously all the materials that make up these samples were also tested in the laboratory as well as their quality. It was concluded that the asphalt content that met the requirements for the best quality of this Latasir was 7%, 710 kg stability, 6.170% air cavity, the quotient for marshall was 3.533 KN / mm, mixed density 2.183 kg / dm³ and melting 2.890 mm.

Highway capacity in work zones – experiences in foreign conditions

Traffic management in the highway work zones is a challenge for all traffic engineers. Road work zones are one of the most significant problems for the normal realization of traffic conditions, which can cause various consequences that will greatly reduce capacity and reduce the level of service. On the sections in the work zone, bottlenecks appear, which result in congestion, ie. lead to an imbalance of traffic demand and road capacity. This paper provides an overview of the literature and foreign experiences and ways of regulating traffic in the work zones on the highway. Bearing in mind that we are talking about roads of the highest rank, where are sections with work zones, it is necessary to maintain a satisfactory level of service by applying the concept of regulation that will minimally interfere the normal realization of traffic conditions.