Expectatives de l'evolució del transport de mercaderies i persones a l'arc mediterrani

El Departament de Territori i Sostenibilitat organitza un cicle de tres jornades de treball i de reflexió amb l’objectiu principal d’identificar i analitzar quines són les condicions territorials que afavoreixen l’activitat econòmica internacional de Catalunya.Postprint (published version

Implementation of connected and autonomous vehicles in cities could have neutral effects on the total travel time costs: modeling and analysis for a circular city

Autonomous vehicles promise to revolutionize the automobile market, although their implementation could take several decades in which both types of cars will coexist on the streets. We formulate a model for a circular city based on continuous approximations, considering demand surfaces over the city. Numerical results from our model predict direct and indirect effects of connected and autonomous vehicles. Direct effects will be positive for our cities: (a) less street supply is needed to accommodate the traffic; (b) congestion levels decrease: travel costs may decrease by 30%. Some indirect effects will counterbalance these positive effects: (c) a decrease of 20% in the value of travel time can reduce the total cost by a third; (d) induced demand could be as high as 50%, bringing equivalent total costs in the future scenario; (e) the vehicle-kilometers traveled could also affect the future scenario; and (f) increases in city size and urban sprawl. As a conclusion, the implementation of autonomous vehicles could be neutral for the cities regarding travel time costs. City planning agencies still have to promote complementary modes such as active mobility (walking and bicycle), transit (public transportation), and shared mobility (shared autonomous vehicles and mobility as a service).Peer ReviewedPostprint (published version

Logística de la distribució urbana de mercaderies

La Distribució Urbana de mercaderies és un procés vital i per tant estratègic per al creixement econòmic, social i cultural d'una ciutat. Múltiples factors i actors diversos presenten interessos contraposats que xoquen amb especial virulència a les ciutats europees més dinàmiques i al centres històrics de qualsevol ciutat. No existeixen solucions simples a aquest problema, i el sector s'atorga històricament un paper de "víctima" d'un cert "oblit" a tots els nivells. L'article revisa la situació i els actors implicats i els seus punts de vista, analitza els costums actuals, exposa les tendències detectades i proposa millores d'implantació factible.La Distribución Urbana de mercancías es un proceso vital, y por tanto estratégico, para el crecimiento económico, social y cultural de una ciudad. Múltiples factores y actores diversos presentan intereses contrapuestos que chocan con especial virulencia en las ciudades europeas más dinámicas y en los centros históricos de cualquier ciudad. No existen soluciones simples a este problema, y el sector se otorga históricamente un papel de "víctima" de un cierto "olvido" en todos los niveles. El artículo revisa la situación y los actores implicados y sus puntos de vista, analiza las costumbres actuales, expone las tendencias detectadas y propone mejoras de implantación factible.The Urban Goods Distribution is a vital and therefore strategic process for the economic, social and cultural growth of a city. Many factors and actors have opposite interests, that clash with special virulence in the most dynamic European cities, and in the historic centres of any city. There are not easy solutions to this problem, and this sector gives itself a role of "victim" of "forgetfulness" at all levels. The article revises the involved actors and their points of view, analyses the current habits, shows the detected trends, and proposes feasible measures for improvement.La distribution urbaine des marchandises est un processus vital et, par conséquent, stratégique pour le développement économique, social et culturel d'une ville. De nombreux facteurs et divers acteurs présentent des intérêts opposés qui choquent avec une force spéciale dans les villes européennes les plus dynamiques et dans les centres historiques des villes. Les solutions faciles n'existent pas et le secteur s'attribue historiquement un rôle de «victime» d'un certain «oubli» à tous les niveaux. L'article examine la situation et les acteurs impliqués ainsi que leur point de vue, analyse aussi les coutumes actuelles, expose les tendances détectées et propose des améliorations d'implantations possibles

Routing design for less-than-truckload motor carriers using ant colony techniques

One of the most important challenges for Less-Than-Truck-Load carriers consists of determining how to consolidate flows of small shipments to minimize costs while maintaining a certain level of service. For any origin-destination pair, there are several strategies to consolidate flows, but the most usual ones are: peddling/collecting routes and shipping through one or more break-bulk terminals. Therefore, the target is determining a route for each origin-destination pair that minimizes the total transportation and handling cost guaranteeing a certain level of service. Exact resolution is not viable for real size problems due to the excessive computational time required. This research studies different aspects of the problem and provides a metaheuristic algorithm (based on Ant Colonies Optimization techniques) capable of solving real problems in a reasonable computational time. The viability of the approach has been proved by means of the application of the algorithm to a real Spanish case, obtaining encouraging results

ROUTING DESIGN FOR LESS-THAN-TRUCKLOAD MOTOR CARRIERS USING ANT COLONY TECHNIQUES

One of the most important challenges for Less-Than-Truck-Load carriers consists of determining how to consolidate flows of small shipments to minimize costs while maintaining a certain level of service. For any origin-destination pair, there are several strategies to consolidate flows, but the most usual ones are: peddling/collecting routes and shipping through one or more break-bulk terminals. Therefore, the target is determining a route for each origin-destination pair that minimizes the total transportation and handling cost guaranteeing a certain level of service. Exact resolution is not viable for real size problems due to the excessive computational time required. This research studies different aspects of the problem and provides a metaheuristic algorithm (based on Ant Colonies Optimization techniques) capable of solving real problems in a reasonable computational time. The viability of the approach has been proved by means of the application of the algorithm to a real Spanish case, obtaining encouraging results.

Optimització d'operacions en aeroports

La ponència tracta les operacions aeroportuàries des de la perspectiva de sistema de transport, desenvolupant models d’optimització per millorar el rendiment del sistema en base a la reducció de les variables temps i costos i la millora de la fiabilitat dels processos