Best practice analyses, case studies and expert discussion (see appendix) led to the following priority issues. These issues are likely to play a central role in the implementation of an integrated approach and will be prioritized in the further application in the prologue studies:

A. Spatial Synergy

In order to research the spatial synergy between networks, infrastructure, land use and urban vitality several approaches have shown to be fruitful. Most promising for prologue application are:

A1: Spatial correlation

In order to generate solutions with optimal synergy between network, land use, mobility and liveability spatial correlation can be investigated in spatial development models, spatial investment agenda’s, spatial development agenda’s etc.

A2: Spatial intermediation

By means of spatial intermediation such as quality teams, chief government advisors and supervisors an in-process flexible (independent) knowledge base can lead to better integrated planning.

A3: Spatial communication.

By means of spatial communication tools such as mapping, drawing, calculating and 3D visualisation techniques. Experts from diverse technical backgrounds can develop an common language in order to create integrated solutions and consensus.

B. Multi-modal networking

Many practices show that the multi-modal optimisation often forms a base for a sustainable solution. Following issues need to be further researched in order to make this common practice across Europe:

B1: Multi-modal analysis (see also LUTI roadmap)

An important aspect of this research is the quantification of potential multimodal transport solutions on modal shift action from motorway networks to other modalities (especially in urban areas). Are multi-modality solutions for example a way to ensure that the growing demand for freight transport can be handled in existing networks – preferably without additional road – expansion measures?

B2: The role of spatial quality/constellation in order to create vital multimodal nodes (see category A)

The performance of a (multimodal) network is closely related to the spatial quality of the nodes and routes. Issues such as (social)safety, barriers forming, spatial attractiveness and flexibility/adaptiveness are crucial in successful network development.

B3: Role of the network provider
The role of the network provider in a multimodal context towards sustainable spatial development is currently developing rapidly. In many countries we see network operators moving from a small scope technical solution driven interest towards a broad scope, multi modal network interest.

C. Acupuncture: added value on a (regional, daily urban system) systems level

Around the world a large variety of value capturing instruments is used to finance public infrastructure works from land and property development. Complete overviews of this kind of tools and of their effectiveness do not exist (see also Alterman, 2012). Often European cities stick to traditional ‘local’ value capturing tools and ignore alternative instruments. Especially the research on an ‘acupunctural strategy’ across a full scale transport system needs to be addressed. The core of this strategy consists of specific local interventions in different modalities that have an overall impact.

D. Strategic maintenance & renewal: from repair to system optimization

Research is needed not only on the planning of new infrastructure, but also on the upgrading of existing infrastructure. Research should be conducted to look at the possibilities that arise at the moment of the maintenance of old infrastructure, not only to simply replace, but to use the moment as a means to be flexible and adapt to new situations (smart maintenance redesign) effect on the value of the whole system as well as on the overall efficiency of the corridor. For the acupunctural interventions, a range of tools can be applied, for example spatial design, rules/laws, financial stimulation measures an governance arrangements. The research should focus on the development of tools to value the effects of acupunctural interventions on the level of the system.