scholarly journals Impact Assessment of Long-Term Work Zones in Arterial Roads on Commercial Activities in Dammam Metropolitan Area, Saudi Arabia

2018 ◽  
Vol 29 (2) ◽  
pp. 19-36
Author(s):  
Nawaf M. Alshabibi Nawaf M. Alshabibi
Keyword(s):  
Metropolitan Area ◽  
Field Survey ◽  
Business Owners ◽  
Work Zone ◽  
Work Zones ◽  
Commercial Activities ◽  
First Case ◽  
Negative Impacts ◽  
The Impact

This paper assesses the impact of long-term work zones in arterial roads on commercial activities in Dammam Metropolitan area. The study focuses on two cases of long-term work zones in arterials in two major cities in Dammam Metropolitan Area. The first case is a work zone with full lanes closure on Prince Mohamed Bin Fahad Road at the south east entrance of Dammam city. The second case is a work zone with full lanes closure on King Abdul-Aziz Road at the northern entrance of Al-Khobar City. Data collection relies on field survey including questionnaires to affected business owners and managers. The questionnaire has been developed to assess the impact before and during road works period, in the work zone, on mobility and accessibility to commercial activities. Field survey includes 201 commercial activities at two work zone locations. Answers have been registered in Excel spreadsheet. Data analysis includes percentages of change, means, and standard deviation of dependent variables before and during the presence of the work zone. It was found that long-term work zones on arterials have multiple negative impacts on workers, sales, and customers. These impacts are related to lack of mobility, accessibility and reduction of parking availability during work period. Also, restaurants and travel agencies were the most effected activities by work zone presence, while banks were the least effected.

scholarly journals The Implications of HIV Treatment on the HIV-Malaria Coinfection Dynamics: A Modeling Perspective

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
F. Nyabadza ◽  
B. T. Bekele ◽  
M. A. Rúa ◽  
D. M. Malonza ◽  
N. Chiduku ◽  
...  
Keyword(s):  
Hiv Treatment ◽  
Pathogen Transmission ◽  
Disease Epidemiology ◽  
Qualitative Dynamics ◽  
Potential Impact ◽  
Negative Impacts ◽  
Long Term Behavior ◽  
The Impact ◽  
Multiple Pathogens

Most hosts harbor multiple pathogens at the same time in disease epidemiology. Multiple pathogens have the potential for interaction resulting in negative impacts on host fitness or alterations in pathogen transmission dynamics. In this paper we develop a mathematical model describing the dynamics of HIV-malaria coinfection. Additionally, we extended our model to examine the role treatment (of malaria and HIV) plays in altering populations’ dynamics. Our model consists of 13 interlinked equations which allow us to explore multiple aspects of HIV-malaria transmission and treatment. We perform qualitative analysis of the model that includes positivity and boundedness of solutions. Furthermore, we evaluate the reproductive numbers corresponding to the submodels and investigate the long term behavior of the submodels. We also consider the qualitative dynamics of the full model. Sensitivity analysis is done to determine the impact of some chosen parameters on the dynamics of malaria. Finally, numerical simulations illustrate the potential impact of the treatment scenarios and confirm our analytical results.

Application of LiDAR and Connected Vehicle Data to Evaluate the Impact of Work Zone Geometry on Freeway Traffic Operations

2018 ◽  
Vol 2672 (16) ◽  
pp. 1-13 ◽  
Author(s):  
Michelle M. Mekker ◽  
Yun-Jou Lin ◽  
Magdy K. I. Elbahnasawy ◽  
Tamer S. A. Shamseldin ◽  
Howell Li ◽  
...  
Keyword(s):  
Case Studies ◽  
Work Zone ◽  
Extensive Literature ◽  
Vehicle Speed ◽  
Connected Vehicle ◽  
Traffic Operations ◽  
Work Zones ◽  
Geometric Data ◽  
Vehicle Data ◽  
The Impact

Extensive literature exists regarding recommendations for lane widths, merging tapers, and work zone geometry to provide safe and efficient traffic operations. However, it is often infeasible or unsafe for inspectors to check these geometric features in a freeway work zone. This paper discusses the integration of LiDAR (Light Detection And Ranging)-generated geometric data with connected vehicle speed data to evaluate the impact of work zone geometry on traffic operations. Connected vehicle speed data can be used at both a system-wide (statewide) or segment-level view to identify periods of congestion and queueing. Examples of regional trends, localized incidents, and recurring bottlenecks are shown in the data in this paper. A LiDAR-mounted vehicle was deployed to a variety of work zones where recurring bottlenecks were identified to collect geometric data. In total, 350 directional miles were covered, resulting in approximately 360 GB of data. Two case studies, where geometric anomalies were identified, are discussed in this paper: a short segment with a narrow lane width of 10–10.5 feet and a merging taper that was about 200 feet shorter than recommended by the Manual on Uniform Traffic Control Devices. In both case studies, these work zone features did not conform to project specifications but were difficult to assess safely by an inspector in the field because of the high volume of traffic. The paper concludes by recommending the use of connected vehicle data to systematically identify work zones with recurring congestion and the use of LiDAR to assess work zone geometrics.

scholarly journals DAMPAK PEMBERITAAN PENYALAHGUNAAN FORMALIN DI SEKTOR KELAUTAN DAN PERIKANAN

2017 ◽  
Vol 2 (1) ◽  
pp. 83
Author(s):  
Yayan Hikmayani ◽  
Siti Hajar Suryawati ◽  
Agus Heri Purnomo ◽  
Zahri Nasution
Keyword(s):  
Policy Analysis ◽  
Field Survey ◽  
Positive Impact ◽  
Secondary Data ◽  
Fish Products ◽  
On Demand ◽  
Central Java ◽  
Field Notes ◽  
Negative Impacts ◽  
The Impact

Riset dampak pemberitaan penyalahgunaan formalin di sektor kelautan dan perikanan telah dilakukan pada tahun 2006. Riset ini bertujuan untuk melihat sejauhmana dampak yang ditimbulkan akibat pemberitaan tentang penyalahgunaan formalin di sektor kelautan dan perikanan pada produsen dan konsumen. Pendekatan studi digunakan melalui analisis kebijakan. Data primer dan sekunder dirumuskan sesuai keperluan analisis kebijakan ini yaitu penelusuran terhadap dampak pemberitaan formalin terhadap produsen dan konsumen di sektor kelautan dan perikanan. Kemudian data hasil verifikasi dan survey lapang yang berasal dari kuesioner dan catatan lapangan (field notes) diolah secara deskriptif untuk mendapatkan interpretasi logis. Lokasi studi ditetapkan secara sengaja (purposive) dengan kriteria tersebut merupakan sentra penanganan dan pengolahan produk perikanan dan diberitakan banyak menggunakan bahan kimia formalin yaitu Jawa Barat (Karawang), Jawa Tengah (Semarang), DKI Jakarta dan Bandar Lampung. Hasil studi menunjukkan bahwa bagi produsen yang meliputi nelayan, pengolah dan pembudidaya ikan dampak negatif dari pemberitaan formalin adalah menurunnya permintaan ikan hasil tangkapan dan olahan sehingga pendapatan nelayan dan pengolah menjadi berkurang, sedangkan bagi konsumen dampak negatifnya konsumen jadi takut mengkonsumsi ikan laut dan hasil olahan sehingga lebih memilih mengkonsumsi tempe/tahu dan telur. Dampak positifnya bagi produsen baik nelayan dan pengolah yaitu sebagian dari mereka jadi mengetahui bahwa formalin tersebut membahayakan dan berusaha tidak menggunakan lagi. Dampak positif bagi konsumen bertambah pengetahuan tentang bahaya formalin sehingga mereka akan lebih hati-hati dalam mengkonsumsi ikan dan untuk sementara konsumsi ikan mereka dialihkan ke ikan hasil budidaya yang banyak dijual dalam kondisi hidup. Tittle: The Impact of Announcement on The Mis-used of Formalin in Marine and Fisheries SectorResearch on impact of mis-used of formalin in marine and fisheries sector have been done in 2006. The aim of the research was to show the impact of announcement on the mis-used of formalin to producers and consumers. Policy analysis approach was used as the method of study. Primary and secondary data were formulated accordingly to meet the requirement of the policy analysis, that is impact of media release on both side of producers and consumers. Verified data and field survey processed descriptively to build logical interpretation.The locations of study were specified in purpose to represent the center of handling and processing of fisheries product indicated with formalyn abuse. These location were West Java (Karawang), Central Java (Semarang), DKI Jakarta and Bandar Lampung. The results of study showed that the negative impacts of the news on formalin abuse to the producers were decreasing on demand of catch and processed fish products, which in turn reduce the income of the fisherman and fish processors. On the other side, the consumer shift their preference to other products such as tempe, tofu and eggs. The positive impacts to the fisherman and fish processors were the knowledge of the danger of formalin abuse on their products and they avoid to use the chemical. The positive impact on fish consumers were the awareness on formalin use on health arose and temporary their fish consumption shifted to the aqucultured fish which sold in living form.

Introduction

2019 ◽  
pp. 1-20
Author(s):  
Courtney Lewis
Keyword(s):  
Small Business ◽  
Small Businesses ◽  
Structural Adjustment ◽  
Business Owners ◽  
Small Business Owners ◽  
Economic Stability ◽  
The Great Recession ◽  
Justice Movements ◽  
The Impact

This introduction describes how encouraging a diversity of small businesses can help support a Native Nation’s long-term economic stability, but goes further to demonstrate this uniquely through the eyes of the small-business owners themselves along with an in-depth examination of their local, national, and international contexts. In doing so, it describes how this book also addresses the ways in which Native Nations, by supporting small business resilience, are responding in politically and socioeconomically meaningful ways to settler-colonial economic subjugations. This introduction further describes how the book unpacks the layers of small-business complications specific to Native Nations and American Indian business owners while speaking to larger theoretical questions regarding the impact of small businesses in a global indigenous context. Debates regarding economic sovereignty versus economic power, measures of autonomy, land status, economic identity, fluctuating relationships with settler-colonial society, and the growth of neoliberalism (along with its accompanying “structural adjustment” policies) meet with specific practices, such as the implementation of guaranteed annual incomes, cultural revitalization actions, environmental justice movements, and the potentially precarious choices of economic development—issues that are exacerbated during times of economic precarity, such as the Great Recession.

Evaluation of Interstate Work Zone Mobility using Probe Vehicle Data and Machine Learning Techniques

2019 ◽  
Vol 2673 (2) ◽  
pp. 811-822 ◽  
Author(s):  
Mohsen Kamyab ◽  
Stephen Remias ◽  
Erfan Najmi ◽  
Kerrick Hood ◽  
Mustafa Al-Akshar ◽  
...  
Keyword(s):  
Machine Learning ◽  
Machine Learning Algorithms ◽  
Work Zone ◽  
Third Party ◽  
Machine Learning Techniques ◽  
Work Zones ◽  
Vehicle Data ◽  
Gps Devices ◽  
Future Work ◽  
The Impact

According to the Federal Highway Administration (FHWA), US work zones on freeways account for nearly 24% of nonrecurring freeway delays and 10% of overall congestion. Historically, there have been limited scalable datasets to investigate the specific causes of congestion due to work zones or to improve work zone planning processes to characterize the impact of work zone congestion. In recent years, third-party data vendors have provided scalable speed data from Global Positioning System (GPS) devices and cell phones which can be used to characterize mobility on all roadways. Each work zone has unique characteristics and varying mobility impacts which are predicted during the planning and design phases, but can realistically be quite different from what is ultimately experienced by the traveling public. This paper uses these datasets to introduce a scalable Work Zone Mobility Audit (WZMA) template. Additionally, the paper uses metrics developed for individual work zones to characterize the impact of more than 250 work zones varying in length and duration from Southeast Michigan. The authors make recommendations to work zone engineers on useful data to collect for improving the WZMA. As more systematic work zone data are collected, improved analytical assessment techniques, such as machine learning processes, can be used to identify the factors that will predict future work zone impacts. The paper concludes by demonstrating two machine learning algorithms, Random Forest and XGBoost, which show historical speed variation is a critical component when predicting the mobility impact of work zones.

scholarly journals Risk Factors in Work Zone Safety Events: A Naturalistic Driving Study Analysis

2019 ◽  
Vol 2673 (1) ◽  
pp. 379-387 ◽  
Author(s):  
Nipjyoti Bharadwaj ◽  
Praveen Edara ◽  
Carlos Sun
Keyword(s):  
Risk Factors ◽  
Driver Behavior ◽  
Work Zone ◽  
Crash Risk ◽  
Work Zones ◽  
Binary Logistic Regression Model ◽  
Work Zone Safety ◽  
Naturalistic Driving Study ◽  
Naturalistic Driving ◽  
The Impact

Identification of crash risk factors and enhancing safety at work zones is a major priority for transportation agencies. There is a critical need for collecting comprehensive data related to work zone safety. The naturalistic driving study (NDS) data offers a rare opportunity for a first-hand view of crashes and near-crashes (CNC) that occur in and around work zones. NDS includes information related to driver behavior and various non-driving related tasks performed while driving. Thus, the impact of driver behavior on crash risk along with infrastructure and traffic variables can be assessed. This study: (1) investigated risk factors associated with safety critical events occurring in a work zone; (2) developed a binary logistic regression model to estimate crash risk in work zones; and (3) quantified risk for different factors using matched case-control design and odds ratios (OR). The predictive ability of the model was evaluated by developing receiver operating characteristic curves for training and validation datasets. The results indicate that performing a non-driving related secondary task for more than 6 seconds increases the CNC risk by 5.46 times. Driver inattention was found to be the most critical behavioral factor contributing to CNC risk with an odds ratio of 29.06. In addition, traffic conditions corresponding to Level of Service (LOS) D exhibited the highest level of CNC risk in work zones. This study represents one of the first efforts to closely examine work zone events in the Transportation Research Board’s second Strategic Highway Research Program (SHRP 2) NDS data to better understand factors contributing to increased crash risk in work zones.

Work Zone Coordination Software Tool

2017 ◽  
Vol 2617 (1) ◽  
pp. 60-70 ◽  
Author(s):  
Bekir Bartin ◽  
Kaan Ozbay ◽  
Matthew D. Maggio ◽  
Hao Wang
Keyword(s):  
New Jersey ◽  
Construction Projects ◽  
Software Tool ◽  
Work Zone ◽  
Department Of Transportation ◽  
Work Zones ◽  
Web Based ◽  
Departments Of Transportation ◽  
Transportation Agencies

Faced with a growing number of work zones, transportation agencies are being challenged to effectively manage the impacts of these zones, alleviate congestion, and maintain the safety of motorists and workers without disrupting project schedules. Coordinating work zones has already been practiced by various state departments of transportation and transportation agencies, yet there are no universal department of transportation policies that address how agencies should coordinate or consolidate projects. In addition, only a few states utilize computer tools specific to regional or corridor-based work zone coordination. State departments of transportation mostly coordinate significant and long-term projects. However, the majority of roadway projects include minor repair, roadway maintenance, bridge maintenance, surveying, and landscape and utility work that require relatively short-term work zones. The Work Zone Coordination Software tool was developed to provide the New Jersey Department of Transportation with an easy-to-use tool to evaluate the feasibility and effectiveness of coordinating short- and long-term work zones and to measure the benefits. This online tool is implemented with a web-based user interface. It integrates all scheduled and active construction projects, identifies conflicts between work zone projects, and estimates the benefits of conflict mitigation. The Work Zone Coordination Software tool works with the New Jersey work zone database by automatically importing data to provide up-to-date information to its users. However, the tool is built on a flexible framework that allows the integration of any work zone database provided that it includes all the required information.

scholarly journals Impact of Biochar on Earthworm Populations: A Review

2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Sharon L. Weyers ◽  
Kurt A. Spokas
Keyword(s):  
Black Carbon ◽  
Total Biomass ◽  
Short Term ◽  
Feeding Behaviors ◽  
Soil System ◽  
Earthworm Population ◽  
Negative Impacts ◽  
The Impact ◽  
Earthworm Populations

Despite the overwhelming importance of earthworm activity in the soil system, there are a limited number of studies that have examined the impact resulting from biochar addition to soil. Biochar is part of the black carbon continuum of chemo-thermal converted biomass. This review summarizes existing data pertaining to earthworms where biochar and other black carbon substances, including slash-and-burn charcoals and wood ash, have been applied. After analyzing existing studies on black carbon, we identified that these additions have a range from short-term negative impacts to long-term null effects on earthworm population density and total biomass. Documented cases of mortality were found with certain biochar-soil combinations; the cause is not fully understood, but hypothesized to be related to pH, whether the black carbon is premoistened, affects feeding behaviors, or other unknown factors. With wood ashes, negative impacts were overcome with addition of other carbon substrates. Given that field data is limited, soils amended with biochar did not appear to cause significant long-term impacts. However, this may indicate that the magnitude of short-term negative impacts on earthworm populations can be reduced with time.

Crash Testing and Evaluation of Work Zone Traffic Control Devices

1998 ◽  
Vol 1650 (1) ◽  
pp. 45-54 ◽  
Author(s):  
King K. Mak ◽  
Roger P. Bligh ◽  
Lewis R. Rhodes
Keyword(s):  
Traffic Control ◽  
Evaluation Criteria ◽  
Work Zone ◽  
Work Zones ◽  
Impact Performance ◽  
Crash Testing ◽  
Control Devices ◽  
Traffic Control Devices ◽  
Under Construction ◽  
The Impact

Safety of work zones is a major area of concern since it is not always possible to maintain a level of safety comparable to that of a normal highway not under construction. Proper traffic control is critical to the safety of work zones. However, traffic control devices themselves may pose a safety hazard when impacted by errant vehicles. The impact performance of many work zone traffic control devices is mostly unknown, and little, if any, crash testing has been conducted in accordance with guidelines set forth in NCHRP Report 350. The Texas Department of Transportation (TxDOT) has, in recent years, sponsored a number of studies at the Texas Transportation Institute to assess the impact performance of various work zone traffic control devices, including plastic drums and sign substrates, temporary and portable sign supports, plastic cones, vertical panels, and barricades. The results, findings, conclusions, and recommendations are presented for temporary and portable sign supports, plastic drums, sign substrates for use with plastic drums, traffic cones, and vertical panels, whereas those for barricades are covered elsewhere. Most of the work zone traffic control devices satisfactorily met the evaluation criteria set forth in NCHRP Report 350 and are recommended for field implementation. However, some of the devices failed to perform satisfactorily and are not recommended for field applications. The results from these studies are being incorporated into the TxDOT barricade and construction standard sheets for use in work zones.

Sign in / Sign up

Export Citation Format

Share Document