Dealing with interrelatedness and fragmentation in road infrastructure planning: an analysis of integrated approaches throughout the planning process in the Netherlands

Planning approaches that integrate road infrastructure and other land uses are being increasingly applied. Dealing with functional interrelatedness and stakeholder fragmentation are the main reasons for this. This article conceptualizes and analyses why and how such integrated approaches can be applied effectively throughout consecutive stages of infrastructure planning. The two case studies illustrate that the concept of integration is applied for strategic as well as operational reasons, and they reveal that these reasons may alternate throughout the planning process. Effective integration is therefore dynamic: it appropriately focuses on strengthening the socio-economic perspectives of a region for the longer term, as well as on the relations between different land uses that are physically adjacent and competing for space within a smaller area. Due to fragmented institutional contexts, successfully dealing with interrelatedness requires an intense level of interaction amongst involved actors. Such “co-production” of visions and plans has two important characteristics: negotiation, and learning about each other’s goals. Ultimately the case studies also show that planning at the infrastructure–land use interface needs institutional mechanisms to guide the alterations between strategically and operationally inspired integration. Contracts with private parties, public participation, and positive conditions for learning about each other’s referential frames are examples of the institutional mechanisms encountered in this study.     

Towards sustainable infrastructure development through integrated contracts: Experiences with inclusiveness in Dutch infrastructure projects

Current complex society necessitates finding inclusive arrangements for delivering sustainable road infrastructure integrating design, construction and maintenance stages of the project lifecycle. In this article we investigate whether linking stages by integrated contracts can lead to more sustainable road infrastructure development by assessing public and private experiences with inclusiveness of integrated Dutch Design-Build-Finance-Maintain (DBFM) projects throughout the procurement, design, construction and maintenance and operation stages. Through semi-structured interviews and document analysis, we find that public and private parties experience that inclusiveness is increased by DBFM contracts, although differences between investigated actor, scope and time dimensions of inclusiveness exist. We conclude that integrated contracts can lead to more sustainable infrastructure development because of the lifecycle optimization incentives provided by the linked contract stages of design, construction and maintenance. Based on our findings we recommend to pursue three avenues towards more sustainable infrastructure development: green procurement, strategic asset management and relational contracting.     

Revisiting a programmatic planning approach: managing linkages between transport and land use planning

The body of knowledge on transport and land use planning shows considerable overlap with management theories and practices. Notable examples can be found in project management and strategic management. Recently, in the field of management theory, the idea of programme management has gained prominence in response to the need to coordinate on a tactical level. Programme management links to both strategic management and project management, as it focuses on the coordinated management of related projects in order to realize strategic objectives. In line with the tradition to integrate management theories into spatial planning, the aim of this paper is to explore the power of a programme management approach in a transport and land use planning context. We investigate whether and how a programme management approach when applied in transport and land use planning can deal with three important interrelated challenges that emerge between the strategic and operational level in transport and land use planning: (1) linking strategic goals to operational projects, (2) developing the accompanying joint organizational structures, and (3) moulding fixed and separate procedures into more adaptive joint decision-making processes. To do so, we conducted an in-depth case study of two recent programme management approaches in Dutch transport and land use planning. We show that both programmes function as platforms where different parties come together and where a wide range of management and monitoring tools are used to guide the programme in a specific direction.     

Comparison of Neural Networks and Gravity Models in Trip Distribution

Abstract:  Transportation engineers are commonly faced with the question of how to extract information from expensive and scarce field data. Modeling the distribution of trips between zones is complex and dependent on the quality and availability of field data. This research explores the performance of neural networks in trip distribution modeling and compares the results with commonly used doubly constrained gravity models. The approach differs from other research in several respects; the study is based on both synthetic data, varying in complexity, as well as real-world data. Furthermore, neural networks and gravity models are calibrated using different percentages of hold out data. Extensive statistical analyses are conducted to obtain necessary sample sizes for significant results. The results show that neural networks outperform gravity models when data are scarce in both synthesized as well as real-world cases. Sample size for statistically significant results is forty times lower for neural networks.