Deployment of interurban ATT test scenarios (DIATS): implications for the European road network

The paper summarizes the research results and implications from the DGVII-f unded Fourth Framework research project Deployment of Interurban ATT Test S cenarios (DIATS). The objective of DIATS was to identify options available in the short and medium terms, for implementing advanced transport telemati cs (ATT) systems for motorway-type roads and to develop scenarios of 'highe st potential impact' for each of the systems identified. Included are the r esults of a Delphi study into the most likely deployment scenarios for ATT technologies. The methodology developed to assess the organizational, socia l, environmental, efficiency, safety and legal concerns associated with new ATT systems is then described. This includes stated preference questionnai res, traffic simulation modelling, driver behaviour assessment using an ins trumented vehicle, analysis of accident databases and literature reviews. A multicriteria analysis of the impacts of a range of ATT systems is then pr esented. In particular, the results discuss the potential impacts of new in -vehicle driver assistance devices such as adaptive cruise control on the o peration and effectiveness of existing fixed-infrastructure systems. The pa per concludes with a prioritized list of deployment strategies of maximum i mpact for all of the systems assessed. The research findings are already be ing applied nationally and a number of field trial assessments that will as sist in this are also proposed.