International Journal of Pavement Engineering, 2014
ABSTRACT This article presents the development and implementation of a multi-objective decision-a... more ABSTRACT This article presents the development and implementation of a multi-objective decision-aid tool (MODAT) which considers different possible goals: minimisation of agency costs; minimisation of user costs; maximisation of the residual value of pavements, etc. The MODAT uses the deterministic pavement performance model used in the AASHTO flexible pavement design method. The application of the new decision-aid tool is illustrated with a case study involving the main road network of Castelo Branco, a district of Portugal. The knee point, which represents the most interesting solution of the Pareto frontier, corresponds to an agency cost weight value of 81% and a weight value of 19% for the residual value of pavements, demonstrating that agency costs, because they are generally much greater than residual value of pavements, dominate the decision process.
This paper presents a Multi-Objective Decision-Aid Tool (MODAT) tested with data from the Estrada... more This paper presents a Multi-Objective Decision-Aid Tool (MODAT) tested with data from the Estradas de Portugal's Pavement Management System (PMS). Nowadays, the PMS used by the main Portuguese concessionaire (Estradas de Portugal, S.A.) uses a deterministic section-linked optimization model with the objective of minimizing the total expected discounted costs over the planning time-span while keeping the road pavements within given quality standards. The MODAT considers three different possible goals: minimization of agency costs (maintenance and rehabilitation costs); minimization of user costs; and maximization of the residual value of pavements. This new approach allows PMS to become interactive decision-aid tools, capable of providing road administrations with answers to "what-if" questions in short periods of time. The MODAT also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method that allows closing of the gap between project and network management. The application of the MODAT is illustrated with a case study involving the main road network of Castelo Branco, a district of Portugal.
International Journal of Pavement Engineering, 2013
ABSTRACT This paper presents the development and implementation of a Multi-Objective Decision-Aid... more ABSTRACT This paper presents the development and implementation of a Multi-Objective Decision-Aid Tool (MODAT) tested with data from the Estradas de Portugal's Pavement Management System. The MODAT uses a multi-objective deterministic section-linked optimisation model with different possible goals: minimisation of agency costs, minimisation of user costs, maximisation of the residual value of pavements, etc. The MODAT also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method. The application of the new Decision-Aid Tool is illustrated with a case study involving the main road network of Castelo Branco, a district of Portugal. In this application, the Knee point, that represents the most interesting solution of the Pareto frontier, corresponds to an agency costs weight value of 4% and an user costs weight value of 96%, demonstrating that user costs, which are generally much higher than agency costs, dominate the decision process.
This paper presents the development and implementation of a Multi-Objective Decision-Aid Tool (MO... more This paper presents the development and implementation of a Multi-Objective Decision-Aid Tool (MODAT) tested with data from Oliveira do Hospital"s Pavement Management System (OHPMS). Nowadays, the OHPMS Decision-Aid Tool uses a deterministic section-linked optimization model with the objective of minimizing the total expected discounted costs over the planning time-span while keeping the road pavements within given quality standards. The MODAT uses a multi-objective deterministic section-linked optimization model with three different possible goals: minimization of agency costs (maintenance and rehabilitation costs); minimization of user costs; and maximization of the residual value of pavements. This new approach allows the Pavement Management Systems (PMS) to become an interactive decision-aid tool, capable of providing road administrations with answers to "what-if" questions in short periods of time. The MODAT also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method that allows closing of the gap between project and network management. The information produced by the MODAT is shown in maps using a Geographic Information System. In this application, the Knee point, that represents the most interesting solution of the Pareto frontier, corresponds to an agency costs weight value of 5% and an user costs weight value of 95%, demonstrating that user costs, because are generally much greater than agency costs, dominates the decision process.
ABSTRACT This paper presents the development and implementation of a new decision-aid tool to be ... more ABSTRACT This paper presents the development and implementation of a new decision-aid tool to be used in the pavement management system of Oliveira do Hospital in Portugal. This system includes the following components: a road network database; a quality evaluation tool; a costs model; a pavement performance model; and a decision-aid tool. The current decision-aid tool uses a deterministic section-linked optimisation model with the objective of minimising the total expected discounted costs over the planning time-span while keeping the road pavements within given quality standards. The new decision-aid tool uses a deterministic section-linked optimisation model with the goal of maximising quality, performance or user benefits over the planning time-span for given annual budget levels. This new approach is suitable for road administrations that strictly adhere to known annual budgets for maintenance and rehabilitation. The current pavement quality and the constraints defined by the annual budgets determine the future quality and level of performance of the road pavements. The new decision-aid tool also uses the deterministic pavement performance model used in the flexible pavement design method of the American Association of State Highway and Transportation Officials, which allows the gap between project and network management to be resolved.
ABSTRACT This paper presents a geographical-information-system (GIS)-based pavement-management sy... more ABSTRACT This paper presents a geographical-information-system (GIS)-based pavement-management system for Oliveira do Hospital in Portugal. The pavement-management system includes the following components: a road network database, a quality evaluation too, a costs model, a pavement performance model and a decision-aid tool. The quality of road pavements is evaluated by the present serviceability index (PSI), representing the condition of the pavement as a function of the following parameters: longitudinal roughness, rutting, cracking, surface disintegration and patching. This pavement quality index is computed by using a modified version of the American Association of State Highways and Transportation Officials (AASHTO) PSI equation. The decision-aid tool uses a deterministic segment-linked optimisation model with the objective of minimisation of the total expected discounted costs over the planning time-span while keeping the road pavements within given quality standards. The decision-aid tool also uses the deterministic pavement-performance model used in the AASHTO flexible pavement-design method that allows the gap between project and network management to be closed. Recent international pavement-management conferences have concluded that this is one of the most important problems to be solved. The information produced by the system is shown in maps using a GIS.
ABSTRACT This paper presents the development and implementation of a new Decision-Aid Tool to be ... more ABSTRACT This paper presents the development and implementation of a new Decision-Aid Tool to be used in the Oliveira do Hospital's Pavement Management System. This system includes the following components: a Road Network Database; a Quality Evaluation Tool; a Costs Model; a Pavement Performance Model; and a Decision-Aid Tool. Nowadays, the Decision-Aid Tool uses a deterministic section-linked optimisation model with the objective of minimising the total expected discounted costs over the planning period while keeping the road pavements within given quality standards. The new Decision-Aid Tool uses a deterministic section-linked optimisation model with the goal of maximising quality, performance or user benefits over the planning period for given annual budget levels. This new approach is suitable for road administrations that strictly adhere to known maintenance and rehabilitation annual budgets. The current pavements quality and the constraints defined by the annual budgets determine the future quality and level of performance of the road pavements. The new Decision-Aid Tool also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method that allows closing the gap between project and network management.
This paper presents the development and implementation of a new Decision-Aid Tool to be used in t... more This paper presents the development and implementation of a new Decision-Aid Tool to be used in the Oliveira do Hospital's Pavement Management System. This system includes the following components: a Road Network Database; a Quality Evaluation Tool; a Costs Model; a Pavement Performance Model; and a Decision-Aid Tool. Nowadays, the Decision-Aid Tool of this PMS uses a deterministic section-linked optimisation model with the objective of minimising the total expected discounted costs over the planning period while keeping the road pavements within given quality standards. The new Decision-Aid Tool uses a deterministic section-linked optimisation model with the goal of maximising quality, performance or user benefits over the planning period for given annual budget levels. This new approach is suitable for road administrations that strictly adhere to known maintenance and rehabilitation annual budgets. The current pavements quality and the constraints defined by the annual budgets determine the future quality and level of performance of the road pavements. The new Decision-Aid Tool also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method that allows closing the gap between project and network management.
International Journal of Pavement Engineering, 2014
ABSTRACT This article presents the development and implementation of a multi-objective decision-a... more ABSTRACT This article presents the development and implementation of a multi-objective decision-aid tool (MODAT) which considers different possible goals: minimisation of agency costs; minimisation of user costs; maximisation of the residual value of pavements, etc. The MODAT uses the deterministic pavement performance model used in the AASHTO flexible pavement design method. The application of the new decision-aid tool is illustrated with a case study involving the main road network of Castelo Branco, a district of Portugal. The knee point, which represents the most interesting solution of the Pareto frontier, corresponds to an agency cost weight value of 81% and a weight value of 19% for the residual value of pavements, demonstrating that agency costs, because they are generally much greater than residual value of pavements, dominate the decision process.
This paper presents a Multi-Objective Decision-Aid Tool (MODAT) tested with data from the Estrada... more This paper presents a Multi-Objective Decision-Aid Tool (MODAT) tested with data from the Estradas de Portugal's Pavement Management System (PMS). Nowadays, the PMS used by the main Portuguese concessionaire (Estradas de Portugal, S.A.) uses a deterministic section-linked optimization model with the objective of minimizing the total expected discounted costs over the planning time-span while keeping the road pavements within given quality standards. The MODAT considers three different possible goals: minimization of agency costs (maintenance and rehabilitation costs); minimization of user costs; and maximization of the residual value of pavements. This new approach allows PMS to become interactive decision-aid tools, capable of providing road administrations with answers to "what-if" questions in short periods of time. The MODAT also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method that allows closing of the gap between project and network management. The application of the MODAT is illustrated with a case study involving the main road network of Castelo Branco, a district of Portugal.
International Journal of Pavement Engineering, 2013
ABSTRACT This paper presents the development and implementation of a Multi-Objective Decision-Aid... more ABSTRACT This paper presents the development and implementation of a Multi-Objective Decision-Aid Tool (MODAT) tested with data from the Estradas de Portugal's Pavement Management System. The MODAT uses a multi-objective deterministic section-linked optimisation model with different possible goals: minimisation of agency costs, minimisation of user costs, maximisation of the residual value of pavements, etc. The MODAT also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method. The application of the new Decision-Aid Tool is illustrated with a case study involving the main road network of Castelo Branco, a district of Portugal. In this application, the Knee point, that represents the most interesting solution of the Pareto frontier, corresponds to an agency costs weight value of 4% and an user costs weight value of 96%, demonstrating that user costs, which are generally much higher than agency costs, dominate the decision process.
This paper presents the development and implementation of a Multi-Objective Decision-Aid Tool (MO... more This paper presents the development and implementation of a Multi-Objective Decision-Aid Tool (MODAT) tested with data from Oliveira do Hospital"s Pavement Management System (OHPMS). Nowadays, the OHPMS Decision-Aid Tool uses a deterministic section-linked optimization model with the objective of minimizing the total expected discounted costs over the planning time-span while keeping the road pavements within given quality standards. The MODAT uses a multi-objective deterministic section-linked optimization model with three different possible goals: minimization of agency costs (maintenance and rehabilitation costs); minimization of user costs; and maximization of the residual value of pavements. This new approach allows the Pavement Management Systems (PMS) to become an interactive decision-aid tool, capable of providing road administrations with answers to "what-if" questions in short periods of time. The MODAT also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method that allows closing of the gap between project and network management. The information produced by the MODAT is shown in maps using a Geographic Information System. In this application, the Knee point, that represents the most interesting solution of the Pareto frontier, corresponds to an agency costs weight value of 5% and an user costs weight value of 95%, demonstrating that user costs, because are generally much greater than agency costs, dominates the decision process.
ABSTRACT This paper presents the development and implementation of a new decision-aid tool to be ... more ABSTRACT This paper presents the development and implementation of a new decision-aid tool to be used in the pavement management system of Oliveira do Hospital in Portugal. This system includes the following components: a road network database; a quality evaluation tool; a costs model; a pavement performance model; and a decision-aid tool. The current decision-aid tool uses a deterministic section-linked optimisation model with the objective of minimising the total expected discounted costs over the planning time-span while keeping the road pavements within given quality standards. The new decision-aid tool uses a deterministic section-linked optimisation model with the goal of maximising quality, performance or user benefits over the planning time-span for given annual budget levels. This new approach is suitable for road administrations that strictly adhere to known annual budgets for maintenance and rehabilitation. The current pavement quality and the constraints defined by the annual budgets determine the future quality and level of performance of the road pavements. The new decision-aid tool also uses the deterministic pavement performance model used in the flexible pavement design method of the American Association of State Highway and Transportation Officials, which allows the gap between project and network management to be resolved.
ABSTRACT This paper presents a geographical-information-system (GIS)-based pavement-management sy... more ABSTRACT This paper presents a geographical-information-system (GIS)-based pavement-management system for Oliveira do Hospital in Portugal. The pavement-management system includes the following components: a road network database, a quality evaluation too, a costs model, a pavement performance model and a decision-aid tool. The quality of road pavements is evaluated by the present serviceability index (PSI), representing the condition of the pavement as a function of the following parameters: longitudinal roughness, rutting, cracking, surface disintegration and patching. This pavement quality index is computed by using a modified version of the American Association of State Highways and Transportation Officials (AASHTO) PSI equation. The decision-aid tool uses a deterministic segment-linked optimisation model with the objective of minimisation of the total expected discounted costs over the planning time-span while keeping the road pavements within given quality standards. The decision-aid tool also uses the deterministic pavement-performance model used in the AASHTO flexible pavement-design method that allows the gap between project and network management to be closed. Recent international pavement-management conferences have concluded that this is one of the most important problems to be solved. The information produced by the system is shown in maps using a GIS.
ABSTRACT This paper presents the development and implementation of a new Decision-Aid Tool to be ... more ABSTRACT This paper presents the development and implementation of a new Decision-Aid Tool to be used in the Oliveira do Hospital's Pavement Management System. This system includes the following components: a Road Network Database; a Quality Evaluation Tool; a Costs Model; a Pavement Performance Model; and a Decision-Aid Tool. Nowadays, the Decision-Aid Tool uses a deterministic section-linked optimisation model with the objective of minimising the total expected discounted costs over the planning period while keeping the road pavements within given quality standards. The new Decision-Aid Tool uses a deterministic section-linked optimisation model with the goal of maximising quality, performance or user benefits over the planning period for given annual budget levels. This new approach is suitable for road administrations that strictly adhere to known maintenance and rehabilitation annual budgets. The current pavements quality and the constraints defined by the annual budgets determine the future quality and level of performance of the road pavements. The new Decision-Aid Tool also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method that allows closing the gap between project and network management.
This paper presents the development and implementation of a new Decision-Aid Tool to be used in t... more This paper presents the development and implementation of a new Decision-Aid Tool to be used in the Oliveira do Hospital's Pavement Management System. This system includes the following components: a Road Network Database; a Quality Evaluation Tool; a Costs Model; a Pavement Performance Model; and a Decision-Aid Tool. Nowadays, the Decision-Aid Tool of this PMS uses a deterministic section-linked optimisation model with the objective of minimising the total expected discounted costs over the planning period while keeping the road pavements within given quality standards. The new Decision-Aid Tool uses a deterministic section-linked optimisation model with the goal of maximising quality, performance or user benefits over the planning period for given annual budget levels. This new approach is suitable for road administrations that strictly adhere to known maintenance and rehabilitation annual budgets. The current pavements quality and the constraints defined by the annual budgets determine the future quality and level of performance of the road pavements. The new Decision-Aid Tool also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method that allows closing the gap between project and network management.
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