Recursos de colección

Archivo Digital UPM (120.672 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Transporte

Mostrando recursos 1 - 20 de 39

  1. Key quality factors at urban interchanges.

    Dell Asin, Giulia; Monzón de Cáceres, Andrés; López Lambas, María Eugenia
    Quality of service should not be overlooked in public transport planning and policy making, as it influences modal shift from car use to more sustainable means. Little research has been conducted on the quality of public transport interchanges from the perspective of current travellers (i.e. perceived quality). This work is thus aimed at identifying key quality factors in urban interchanges, through an exploratory approach (multiple correspondence analysis) that provides novel elements for further research. The methodology was applied at interchanges in Madrid and Gothenburg and the data used in the analysis were collected through customer satisfaction surveys conducted in 2011....

  2. Homogeneization effects of variable speed limits.

    García Castro, Álvaro; Monzón de Cáceres, Andrés
    Changing factors (mainly traffic intensity and weather conditions) affecting road conditions require a suitable optimal speed at any time. To solve this problem, variable speed limit systems (VSL) - as opposed to fixed limits - have been developed in recent decades. This term has included a number of speed management systems, most notably dynamic speed limits (DSL). In order to avoid the indiscriminate use of both terms in the literature, this paper proposes a simple classification and offers a review of some experiences, how their effects are evaluated and their results. This study also presents a key indicator which measures...

  3. Sistema de bicicleta pública: vehículos inteligentes para ciudades sostenibles.

    López Lambas, María Eugenia; Monzón de Cáceres, Andrés
    El artículo se enmarca en la búsqueda de soluciones de transporte, dentro de lo que se ha dado en llamar movilidad inteligente ("smart mobility"). Se analiza el modo bicicleta y, en concreto, cómo las TICs han posibilitado el desarrollo de los sistemas públicos de alquiler a los que, en efecto, se ha dotado de algún tipo de innovación tecnológica. Para ello, se describen algunos de los sistemas más vanguardistas, tanto internacionales como españoles, para finalizar estableciendo la importancia o, más bien, necesidad de introducir la intermodalidad con el transporte público.

  4. BHLS, Bus, tram: tesi, antitesi, sintesi.

    López Lambas, María Eugenia; Valdés Serrano, Cristina
    Il sistema di trasporto detto Bus Rapid Transit (BRT) è stato lanciato a Curitiba, in Brasile, nel 1974 per offrire un trasporto in bus efficiente ed efficace nella città in rapida espansione. Questa sperienza, insieme a quella di Ottawa (1983) e Quito (1994) ha dimostrato di essere una soluzione molto efficiente per il trasporto di massa. Per tutta l’Europa si sono iniziate a sviluppare esperienze simili, introducendo però un concetto diverso per quanto riguarda la qualità di servizio. Infatti sistemi come il “trunk network” nella Svezia, il Metrobus nella Germania oppure il BHNS (Bus à Aut. Niveau de Service) nella Francia...

  5. Empirical analysis of traffic volume for the application of the options theory to highway concessions

    Cabero Colín, Fernando; Sánchez Soliño, Antonio; Lara Galera, Antonio Lorenzo
    *************************************************************************************** EL WCTR es un Congreso de reconocido prestigio internacional en el ámbito de la investigación del transporte que hasta el 2010 publicaba sus libros de abstracts con ISBN. Por ello consideramos que debería seguir teníendose en cuenta para los indicadores de calidad ******************************************************************************************* Investment projects in the field of transportation infrastructures have a high degree of uncertainty and require an important amount of resources. In highway concessions in particular, the calculation of the Net Present Value (NPV) of the project by means of the discount of cash flows, may lead to erroneous results when the project incorporates certain flexibility....

  6. Key factors affecting the efficiency of transport interchanges

    Monzón de Cáceres, Andrés; Alonso Ramos, Andrea; López Lambas, María Eugenia
    This paper provides a meta-analysis of long/short distance passenger interconnectivity within the European context. The analysis is based on the results of the European project HERMES of the 7th EU R&D Programme. The study collected stakeholders and travelers’ valuation and preferences in 5 interchanges in 3 EU countries. To that end a common survey was conducted in the following sites: Gothenburg Central Station (Sweden), Avenida de America Interchange in Madrid, Lleida-Zaragoza railway stations (Spain), and the Intermodal Station of Part Dieu in Lyon (France). The first survey addresses the analysis of the different stakeholders’ opinion on the interchange management and...

  7. Analysis of alternative tendering mechanisms for transportation Public-Private Partnerships

    Sánchez Soliño, Antonio; Gago de Santos, Pilar
    This paper describes a theoretical model based primarily on transaction costs, for comparing the various tendering mechanisms used for transportation Public-Private Partnership (PPP) projects. In particular, the model contrasts negotiated procedures with the open procedure, as defined by the current European Union legislation on public tendering. The model includes both ex ante transaction costs (borne during the tendering stage) and ex post transaction costs (such as enforcement costs, re-negotiation costs, and costs arising from litigation between partners), explaining the trade-off between them. Generally speaking, it is assumed that the open procedure implies lower transaction costs ex ante, while the negotiated...

  8. Application of the agency theory for the analysis of performance-based mechanisms in road management

    Sánchez Soliño, Antonio
    El WCTR es un congreso de reconocido prestigio internacional en el ámbito de la investigación del transporte, y aunque las actas publicadas están en formato digital y sin ISSN ni ISBN, lo consideramos lo suficientemente importante como para que se considere en los indicadores. This paper develops a model based on agency theory to analyze road management systems (under the different contract forms available today) that employ a mechanism of performance indicators to establish the payment of the agent. The base assumption is that of asymmetric information between the principal (Public Authorities) and the agent (contractor) and the risk aversion...

  9. Variable Speed Limits. Review and development of an aggregate indicator based on floating car data.

    García Castro, Álvaro; Monzón de Cáceres, Andrés
    Changing factors (mainly traffic intensity and weather conditions) affecting road conditions require a suitable optimal speed at any time. To solve this problem, variable speed limit systems (VSL) ? as opposed to fixed limits ? have been developed in recent decades. This term has included a number of speed management systems, most notably dynamic speed limits (DSL). In order to avoid the indiscriminate use of both terms in the literature, this paper proposes a simple classification and offers a review of some experiences, how their effects are evaluated and their results This study also presents a key indicator, which measures...

  10. Dealing with traffic risk in Latin American toll roads

    Carpintero Lopez, Samuel; Vassallo Magro, José Manuel; Sánchez Soliño, Antonio
    Análisis de los sistemas de mitigación del riesgo de tráfico en autopistas de peaje en diferentes países de Latinoamérica. This paper presents a cross-country analysis of traffic risk allocation in road concessions of Latin America. It shows that some countries such as Chile, Colombia, and Peru have been greatly concerned with mitigating traffic risk, either by putting into practice public guarantees, implementing flexible term concessions, or through availability payment concessions; whereas other countries such as Mexico and Brazil have assigned traffic risk to the private concessionaire by using fixed-term concession contracts without any traffic guarantees. Based on an analysis of...

  11. Atmospheric modelling of tritium forms transport: review of capabilities and R&D needs for the assessment of fusion facilities environmental impact

    Castro, Paloma; Velarde Mayol, Marta; Ardao, Jose; Perlado Martín, José Manuel; Sedano, Luis
    One of the key scrutiny issues of new coming energy era would be the environmental impact of fusion facilities managing one kg of tritium. The potential change of committed dose regulatory limits together with the implementation of nuclear design principles (As Low as Reasonably achievable - ALARA -, Defense in Depth -D-i-D-) for fusion facilities could strongly impact on the cost of deployment of coming fusion technology. Accurate modeling of environmental tritium transport forms (HT, HTO) for the assessment of fusion facility dosimetric impact in Accidental case appears as of major interest. This paper considers different short-term releases of tritium...

  12. Comparasion of road traffic emission models in Madrid (Spain)

    Borge García, Rafael; Miguel, Isabel de; Paz Martín, David de la; Lumbreras Martin, Julio; Pérez Rodríguez, Javier; Rodríguez Hurtado, María Encarnación
    Many cities in Europe have difficulties to meet the air quality standards set by the European legislation, most particularly the annual mean Limit Value for NO2. Road transport is often the main source of air pollution in urban areas and therefore, there is an increasing need to estimate current and future traffic emissions as accurately as possible. As a consequence, a number of specific emission models and emission factors databases have been developed recently. They present important methodological differences and may result in largely diverging emission figures and thus may lead to alternative policy recommendations. This study compares two approaches...

  13. Implementation and management of private traffic limitation in urban areas: experiences and methodologies.

    López Lambas, María Eugenia; Ricci, Stefano
    This paper shows the results of a research aimed to formulate a general model for supporting the implementation and management of an urban road pricing scheme. After a preliminary work, to define the state of the art in the field of sustainable urban mobility strategies, the problem has been theoretically set up in terms of transport economy, introducing the external costs’ concept duly translated into the principle of pricing for the use of public infrastructures. The research is based on the definition of a set of direct and indirect indicators to qualify the urban areas by land use, mobility, environmental and economic...

  14. Indicadores de calidad en la gestión de carreteras: análisis bajo el enfoque de la Teoría de la Agencia

    Sánchez Soliño, Antonio
    En este trabajo se desarrolla un modelo basado en la teoría de la agencia para analizar los sistemas de gestión de carreteras (en las distintas fórmulas contractuales existentes) que utilizan un sistema de indicadores de calidad para determinar la remuneración del contratista. Para ello, se parte de los supuestos de información asimétrica entre principal (Administración Pública) y agente (contratista), y de aversión al riesgo de este último. Se considera que se establece entre ambos un contrato de tipo lineal, en el que la remuneración del agente contiene un componente fijo y un determinado incentivo para aumentar el esfuerzo realizado por...

  15. Factores clave en la eficiencia de intercambiadores de transporte

    Monzón de Cáceres, Andrés; López Lambas, María Eugenia; Wang, Yang; Alonso Ramos, Andrea
    Los intercambiadores de transporte son pieza clave en la movilidad, en particular cuando se combinan viajes de larga distancia con los de acceso y dispersión. La buena conexión entre ambas partes de un viaje de larga distancia pueden hacer más o menos competitivas las alternativas de transporte público. En el proyecto HERMES del 7 PM de la UE, se ha analizado la eficiencia de varios intercambiadores de transporte. La primera parte del proyecto se centra en analizar la visión de diferentes stakeholders en el diseño, gestión y elementos del intercambiador. Por otra parte, se ha realizado una encuesta a viajeros en...

  16. Mejorar la intermodalidad: un nuevo modelo de negocio

    López Lambas, María Eugenia; Alonso Ramos, Andrea; Monzón de Cáceres, Andrés
    El elevado número de agentes que intervienen en la transferencia entre modos de corta y larga distancia, supone un difícil proceso derivado de la complicada relación entre ellos, dadas las grandes diferencias entre operadores y la necesidad de integrar intereses públicos y privados en un engarce siempre complejo. El proyecto HERMES (7PM-UE), origen de este artículo, cuyo principal objetivo es impulsar el transporte intermodal y desarrollar nuevos escenarios que faciliten la transferencia entre modos, se encuadra en este contexto.

  17. Rebalancing urban mobility: a tale of four cities

    López Lambas, María Eugenia; Corazza, Maria Vittoria; Monzón de Cáceres, Andrés; Musso, Antonio
    The key of mobility in urban planning is not in dispute. Integrated strategies that take into account the interrelations among land use, transport supply and demand and the different transportation modes are more necessary than ever. In Europe, regulatory tools such as local mobility plans or traffic plans have been enforced for a long time, evolving into so-called sustainable urban transport plans (SUTP) ? that is, plans thatmerge urban planning,mobility governance, social awareness and environmental safeguards to develop a vision based on sustainability and equity. Indeed, SUTP are aimed at solving typical problems in current land use, such as urban...

  18. A GPS analysis for urban freight distribution

    Comendador Arquero, Julio; López Lambas, María Eugenia; Monzón de Cáceres, Andrés
    Daily life in urban centers has led to increasing and more demanding freight requirements. Manufacturers, retailers and other urban agents have thus tended towards more frequent and smaller deliveries, resulting in a growing use of light freight vehicles (<3.5 ton). This paper characterizes and analyzes urban freight distribution in order to generate new ways of understanding the phenomenon. Based on a case study of two different-sized Spanish cities using data from GPS, a vehicle observation survey and complementary driver's interviews, the authors propose a categorization of urban freight distribution. The results confirm GPS as a useful tool that allows the...

  19. Unit Root Analysis of Traffic Time Series in Toll Highways

    Sánchez Soliño, Antonio; Lara Galera, Antonio Lorenzo
    Concession contracts in highways often include some kind of clauses (for example, a minimum traffic guarantee) that allow for better management of the business risks. The value of these clauses may be important and should be added to the total value of the concession. However, in these cases, traditional valuation techniques, like the NPV (net present value) of the project, are insufficient. An alternative methodology for the valuation of highway concession is one based on the real options approach. This methodology is generally built on the assumption of the evolution of traffic volume as a GBM (geometric Brownian motion), which...

  20. En busca de la eficiencia perdida: la distribución de mercancías en las ciudades

    García Castro, Álvaro; Comendador Arquero, Julio; López Lambas, María Eugenia; Monzón de Cáceres, Andrés
    Los nuevos modelos de comercio han producido un significativo incremento del movimiento urbano de mercancías, lo que ha resultado en un uso creciente de furgonetas. El movimiento eficiente de mercancías en el ámbito urbano constituye un importante reto, ya que sumado a las consideraciones medioambientales, afecta a la economía a nivel local, regional e incluso nacional. Por ello, una planificación eficiente de estos movimientos resulta cada vez más crítica para todas las partes implicadas. Este estudio se centra en las pequeñas y medianas empresas, ya que representan entre el 70% y el 90% de las empresas de países pertenecientes a...

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