Network-Level Application of Roads Economic Decision Model in Nicaragua

2003 ◽  
Vol 1819 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Rodrigo Archondo-Callao ◽  
Douglas Méndez Talavera ◽  
Lubina Cantarero Zeas
Keyword(s):  
Decision Making ◽  
Consumer Surplus ◽  
Decision Making Process ◽  
Improvement Program ◽  
Unpaved Roads ◽  
Economic Decision ◽  
The Road ◽  
Low Volume Roads ◽  
Low Volume ◽  
Poverty Indicators

A network-level application of the Roads Economic Decision (RED) model in Nicaragua is presented. The RED model was developed by the World Bank to improve the decision-making process for development and maintenance of low-volume roads. The model adopts the consumer surplus approach to estimate transport benefits and is customized to the characteristics of low-volume roads, such as the high uncertainty in the assessment of the model inputs, the difficulties in characterizing the road condition of unpaved roads, and the need for a comprehensive analysis of generated traffic to clearly define all accrued benefits. The network-level application was designed to define a rational maintenance and improvement program for a network of secondary unpaved roads with particular attention to the alternative of improving the network by surfacing roads with concrete blocks and to include in the decision-making process not only economic considerations but also poverty indicators and priorities perceived by local administrators.

Sectional mapping of local roads in Spain

2008 ◽  
Vol 35 (11) ◽  
pp. 1200-1209
Author(s):  
Angel Ibeas ◽  
Hernan Gonzalo_Orden ◽  
Luigi Dell’Olio ◽  
Jose Luis Moura
Keyword(s):  
Decision Making ◽  
Road Network ◽  
Geographic Information ◽  
Decision Making Process ◽  
Northern Spain ◽  
The Road ◽  
Local Roads ◽  
Decision Making Processes ◽  
Low Volume ◽  
Road Segments

The management of any road network can be improved by gathering information about the different road segments that form it. Geographic information systems (GISs) can be used to map and manipulate the large amount of information collected. This helps managers in their analysis of the network and in the decision-making processes. This article explains the development and practical use of the latest mapping carried out on the local roads in the region of Cantabria in northern Spain. The aim of the current study was to perform a thorough analysis of the characteristics of each segment of the road network to update and restructure the existing mapping. A geographic information system (GIS) was used for consulting and analyzing the data obtained now and over previous years. Moreover, the ways this information could be used in the decision-making process were improved for a regional road network which has, in general, a low volume of traffic.

Evaluation of the Long-Term Performance of Woven Geotextile Used between Base Course and Subgrade of a Paved Road

2019 ◽  
Vol 2673 (8) ◽  
pp. 310-321 ◽  
Author(s):  
Saad Ullah ◽  
Burak F. Tanyu ◽  
Erol F. Guler ◽  
Edward J. Hoppe ◽  
Emre Akmaz
Keyword(s):  
Transportation Network ◽  
Experimental Program ◽  
The Road ◽  
Low Volume Roads ◽  
Road Profile ◽  
Low Volume ◽  
Base Course ◽  
Virginia Department ◽  
Paved Road ◽  
Term Performance

The purpose of this research was to investigate the properties of the exhumed geotextile from a low-volume road on the Virginia Department of Transportation network. The exhumed geotextiles have been in service for 23 years, which provided an opportunity to evaluate the longevity of the materials as well as to make assessments of how it relates to the changes in material properties. During this investigation, subgrade and base course materials were also obtained from the same site and an experimental program was developed to evaluate the effectiveness of the exhumed geotextiles for separation, stabilization, and filtration for the base course thicknesses of 4, 6, and 8 in. The results from this study combined with the results from the previous studies conducted at the same site showed that when the geotextile is placed between the subgrade and base course, the thinner the pavement section, the more evident the effectiveness of the geotextile improvements. One important finding of this research was that the placement of a geotextile reduced the particle breakage caused by abrasion under the applied transient loads. This was observed as a stabilization effect of the geotextile inclusion. As a general conclusion, for low-volume roads with relatively thin pavement sections, properly selected geotextiles provide benefits for separating the subgrade and base course (minimizing pumping), filtering infiltrated or ground water, and stabilizing the road profile. These benefits become more apparent when the thickness of the base course is less than 8 in.

Improving Unpaved Roads in Virginia: Case Study

2003 ◽  
Vol 1819 (1) ◽  
pp. 149-154
Author(s):  
Michael W. Dunn ◽  
S. Noelle On
Keyword(s):  
Cost Effective ◽  
Weather Conditions ◽  
Small Scale ◽  
Elected Officials ◽  
Unpaved Roads ◽  
The Road ◽  
Improvement Process ◽  
Key Factor ◽  
Low Volume ◽  
Virginia Department

Minimizing costs and streamlining the construction of low-volume roads offers an opportunity for transportation agencies to effectively meet the needs of rural citizens. The Virginia Department of Transportation (VDOT) maintains approximately 56,941 mi of the state’s roads, including Interstate, primary, and secondary facilities. Between 1987 and 1994, VDOT paved nearly 1,900 mi of unpaved roads. In rural parts of the state, many miles of state-maintained roads still have gravel and dirt surfaces. Each year the local transportation residency offices, in conjunction with local elected officials, contractors, and area citizens, strive to improve and pave as many miles of gravel and dirt roads as possible. The Hillsville Residency of VDOT, located in rural Carroll and Floyd Counties, has developed an efficient and cost-effective method for improving low-volume gravel and dirt roads. This process relies heavily on cooperative efforts by VDOT, contractors, elected officials, and especially citizens. Land donations from citizens represent the cornerstone of this process, signifying that citizen cooperation is the key factor in a project’s success. Because most of the decisions in the improvement process are at the local residency level, trusting relationships and frequent communication can be established, small-scale and local contractors are given more business opportunities, and local VDOT personnel can better understand citizen concerns and perform road improvements accordingly. In addition, the time line for the road improvement process is based on seasons—the most appropriate weather conditions are considered for the work being performed. This program enables more roads to be paved each year, improving the level of service and quality of life for local citizens.

scholarly journals The Ballad of Bourg-Madame: Memory, Exile, and the Spanish Republican Refugees of the Retirada of 1939

2006 ◽  
Vol 51 (1) ◽  
pp. 1-40 ◽  
Author(s):  
Sharif Gemie
Keyword(s):  
Decision Making ◽  
Political Culture ◽  
Identity Formation ◽  
Group Identity ◽  
Decision Making Process ◽  
Politics Of Memory ◽  
The Road

This paper analyses the experience of the Spanish Republican refugees who left Catalonia in the Retirada of January and February 1939. The first section – “the Road to Bourg-Madame” – considers issues of interpretation raised by the refugees' texts: it discusses historiography, the politics of memory, and political culture. In “Bourg-Madame”, the second section, the essay considers the refugees' experiences. It discusses previous patterns of Spanish migration, the decision-making process that preceded the refugees' journey, group identity formation during the Retirada, the gendered dimension of their experiences, the despair felt by many on arrival in France and the reception that the refugees met. The paper ends by discussing the surprising resilience of the refugees.

Nature and Effects of Low-Volume Roads in Botswana

2003 ◽  
Vol 1819 (1) ◽  
pp. 88-95 ◽  
Author(s):  
Bizzar B. Madzikigwa
Keyword(s):  
Rural Areas ◽  
Road Network ◽  
Good Condition ◽  
Construction Materials ◽  
Road Construction ◽  
Rapid Improvement ◽  
The Road ◽  
Low Volume Roads ◽  
Low Volume ◽  
Sand And Gravel

The road sector in Botswana continues to develop its road network throughout the country at a tremendous rate. When Botswana gained independence in 1966, it had only 10 km (16 mi) of bitumen road. By 1992 the total length of bituminous surfaced road reached 3500 km (2,175 mi) out of a total road network of 18 000 km (11,285 mi). These statistics clearly show that the majority of roads are not yet surfaced; these are low-volume roads that provide access to the rural areas where most of the country’s population is found, though in low density. In spite of the rapid improvement in the quality of the national road network in recent years, much remains to be done. In the early 1970s and early 1980s the rural roads unit was introduced in the Ministry of Works Transport and Communications, which was charged with the responsibility of design and construction of low-volume roads around the country in a bid to integrate the country’s road network. This unit was later disbanded in the 1990s, and all roads are improved through the conventional procurement system using private contractors. For these roads the justification of a surfacing project based on conventional economic return methods does not apply, and worse still, the road improvements have to compete with other amenities for the same limited resources. Three ministries in Botswana are responsible for roads: Ministry of Works Transport and Communications, Ministry of Local Government, and Ministry of Trade, Industry, Wildlife and Tourism. These ministries have different responsibilities for different roads within the country, and earth, sand, and gravel roads are found under the jurisdiction of each of the ministries. The major drawbacks concerning low-volume roads in Botswana are inadequate maintenance, poor road construction materials, and the environmental impacts of the roads. Since the budget and resources are inadequate to keep these roads in good condition, it would be prudent to find technological means that would improve the locally available road construction materials so as to minimize their effects on the environment and vehicle operating costs.

scholarly journals Guide for Automation of Low Volume Production

2020 ◽  
Author(s):  
Malin Löfving ◽  
Peter Almström ◽  
Caroline Jarebrant ◽  
Boel Wadman ◽  
Magnus Widfeldt
Keyword(s):  
Decision Making ◽  
Case Studies ◽  
Empirical Data ◽  
Development Process ◽  
Decision Making Process ◽  
Production Economics ◽  
Collaborative Process ◽  
Volume Production ◽  
Low Volume ◽  
Theoretical Considerations

There is a remaining need from both academia and practitioners, to gain further knowledge about the decision making process for automation of low volume production. This paper includes insights of drivers for automation, the development of a guide for low volume production and the outcome of using the guide. The research in this study is based on both empirical data and theoretical considerations. The empirical data was collected in five case studies and a questionnaire. This paper is part of a research project with the main objective to develop knowledge about how flexible automation may contribute to improvements in efficiency, ergonomics, quality and production economics in different industries with low volume production. One of the results in the project was a comprehensive guide, developed, refined and improved in an iterative collaborative process, where tools and parts of the guide were tested and verified by five manufacturing case companies. The paper describes briefly the development process of the guide and content. The requirements of the guide derived from literature, case companies, questionnaire as well as industrial experts. The resulting guide can be used in several ways, depending on the requirements of the application. The guide includes guiding principles, a decision model for the analysis of the company, choice of automation and facts about automation. In the end of the project, four companies had invested or decided to invest in different types of automation.

Surface rutting of thin pavements and gravel roads under standard and reduced tire inflation pressures

2002 ◽  
Vol 29 (5) ◽  
pp. 679-691 ◽  
Author(s):  
Ahmed Shalaby ◽  
Alan Reggin
Keyword(s):  
Low Pressure ◽  
Lake Area ◽  
Thin Membrane ◽  
Heavy Vehicles ◽  
Tire Pressure ◽  
The Road ◽  
Low Volume Roads ◽  
Low Volume ◽  
Pavement Service Life ◽  
Partnership Program

In Canada, over 300 heavy vehicles equipped with central tire inflation systems are being used in forestry, mining, and grain hauling. Since 1995, Saskatchewan Highways and Transportation has permitted truck fleets to operate with primary highway axle loads on secondary highways under a partnership program. This paper reports on the comparison of rutting progression on an accelerated field experiment utilizing standard and reduced tire pressures. The experiment was conducted by Saskatchewan Highways and Transportation in the Big Quill Lake area of southern Saskatchewan. The vehicles used in the experiment were nine-axle B trains, eight-axle B trains, and six-axle semi-trailers. The statistical analysis of rutting data presented in the paper shows that reduced tire pressures can effectively extend the pavement service life of gravel and thin membrane surfaced roads. On the thin membrane pavements, there was less rutting on the low-pressure lane until twice as many vehicles had trafficked the road, and rutting was no worse on the low-pressure lane even when 10 times as many vehicles had trafficked the road. On the gravel surface, rut depth was lower on the low-pressure lane until twice as many trucks had trafficked that lane.Key words: rutting, pavement, central tire inflation, tire pressure, low-volume roads, unsurfaced roads.

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