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Östermalm, Sweden

Lindfors U.,Itasca Consultants AB | Sjoberg J.,Itasca Consultants AB | Vedin P.,Swedish Transport Administration | Swindell R.,Swedish Transport Administration | And 3 more authors.
48th US Rock Mechanics / Geomechanics Symposium 2014 | Year: 2014

The Swedish Transport Administration is currently updating a handbook on the design of rock excavations for road and rail infrastructure. The aim of the handbook is to provide guidelines and practical engineering tools for the planning and design of rock mass excavations. This paper describes the content of the handbook regarding (i) description of the rules and regulations, and how these affect the design work of rock mass excavations, (ii) guidelines to describe the type of design activities that should be implemented during the planning, constructions and operational (management) stages, with respect to the design of the load- bearing structure, (iii) description of how the input data to the design can be developed and presented during various steps in the proccss, and (iv) description of suitable design methodology and appropriate design methods for reinforcement for rock tunnels and rock slopes. Copyright © 2014 ARMA. Source

Otterdahl D.,Sweco Infrastructure AB | Andersson M.,Swedish Transport Administration
19th Intelligent Transport Systems World Congress, ITS 2012 | Year: 2012

This paper describes the new open RSMP protocol and chosen design of for communication between UTC (Urban Traffic Control) system and local controllers (e.g. traffic signals). The new JSON-based [3] ITS-protocol for road-side ITS installations is developed by the Swedish Transport Administration (STA). The RSMP (Road Side Message Protocol) enables standardized means of communication (between systems on the local level and regional level) regardless of vendor or technical area. The paper also considers how sharing experiences in traffic signal control through regular informal "round table discussions" with the major cities in Sweden contributed to the development of an open protocol for ITS. After development work during 2011 a pilot project in cooperation with three major vendors started. In the same time specifications was made for a new matching UTC-system and a tendering took place. Although RSMP is generic for all ITS installation, focus in this paper is targets it's use with traffic signals. Source

Najjar S.S.,American University of Beirut | Sadek S.,American University of Beirut | Alcovero A.,Sweco Infrastructure AB
Journal of Geotechnical and Geoenvironmental Engineering | Year: 2013

Several models have been suggested to estimate the improvement brought by fibers to the shear strength of fiber-reinforced sands. To date, the effectiveness and reliability of these models have not been the subject of a comprehensive evaluation. The objectives of this paper are to (1) compile the experimental data available in the literature on the behavior of fiber-reinforced sands into a comprehensive state-of-the-art database, (2) quantify the model uncertainty and bias of current strength prediction models for fiber-reinforced sands, and (3) provide insight regarding possible modifications that could be made to the formulation of available models to improve their predictive effectiveness and reduce their model uncertainty. Two models that are considered to present the best available approaches to predicting sand-fiber shear strength were evaluated, namely, the "energy-based" model and the "discrete" model. The energy-based model was found to underestimate the measured friction coefficient on average by about 10%, while the discrete model overestimated the friction coefficient by 6%, with associated coefficients of variation on bias values of 0.20 and 0.17, respectively. With the introduction of minor modifications to these models, the average bias error was eliminated, and the coefficients of variation in the ratio of predicted to measured shear strength (bias) were reduced to 0.17 and 0.12, respectively, for the two models. © 2013 American Society of Civil Engineers. Source

Sevefelt B.,Swedish Transport Administration | Wessel P.,Sweco Infrastructure AB
19th Intelligent Transport Systems World Congress, ITS 2012 | Year: 2012

This paper will give a thoroughly description of the implementation of Variable Speed Limits in 12 intersections in the Swedish countryside. We will present the thoughts and ideas behind the Variable Speed Limit solution. We will also provide a picture of the traffic and technical solutions. And finally we will present the evaluated effects and suggestions for the future. Source

Bidar L.H.,Sweco Infrastructure AB | Carlsson L.,Swedish Transport Agency | Rasmussen S.,Soren Rasmussen
19th Intelligent Transport Systems World Congress, ITS 2012 | Year: 2012

As required by the EFC Directive (2004/52/EC) and EETS Decision (2009/750/EC) an EETS Provider shall perform verification of the interoperability constituent (OBE) within each EETS Toll Domain. The EETS Toll Domains within Norway, Sweden, Denmark and Austria are cooperating in an EFC interoperability service named EasyGo. The EasyGo Toll Chargers shall make available test facilities and support the EETS Provider in the OBE suitability for use process. The paper presents the concept and benefits of the EasyGo cooperation for the planning and performance of the EETS Suitability for use test. Source

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