CORDIS provides links to public deliverables and publications of HORIZON projects.
Links to deliverables and publications from FP7 projects, as well as links to some specific result types such as dataset and software, are dynamically retrieved from OpenAIRE .
Exploitable results
The key objectives were: - Identify options for implementing 'co-operative' driving based upon Advanced Transport Telematics (ATT) systems for motorway type roads.- Develop scenarios of 'highest potential impacts' identified for each of the systems identified.- Identify key elements needed to successfully deploy these measures and create awareness of the potential of this area of Transport Telematics Information Management (TTIM ).- Key findings of the DIATS study:- Further deployment of fixed-infrastructure ATT systems is a priority for network operators along with assessment of Advanced Driver Assistance Systems (ADAS) such as Adaptive Cruise Control (ACC) that are now reaching the market.- A sound base against which Intelligent Transport System technologies can be evaluated has been developed with a range of models.- The ATT applications being most frequently deployed by network operators in Europe are Automatic Incident Detection (AID) with Variable Speed Limits (VSL) to reduce the potential for secondary incidents on the network.- Most operators considered the linking of AID and VSL with Variable Message Signs to provide information regarding routing options to be necessary, with a control centre essential to co-ordinate operations.- Roadside warning lights were shown to offer potential safety improvements, particularly in areas with poor visibility and prone to bad weather.- Approximately 45% of network operators said that they intended to deploy ramp metering on part of their network by 2002. Clear evidence of the potential for ramp metering to reduce congestion on main carriageways was demonstrated.- It is recommended that national investigations into the impacts of local conditions (e.g. ramp geometry, ratio of on-ramp to main carriageway flow) be undertaken to establish guidelines for widespread implementation of ramp metering.- A clear majority of operators felt that ramp metering should be managed through a control room. Network operators expressed concern about the potential diversionary impacts of ramp metering because of delay on the on-ramps. A more holistic approach to controlling access to motorways is recommended.- ACC is unlikely to have significant impacts on the traffic efficiency of motorways in the near future. Penetration rates below 20% have been shown to have little impact. In addition, it seems likely that drivers will choose not to use ACC systems near intersections when lane changing is frequent as first generation ACC systems will not satisfactorily respond to cut-in manoeuvres.- ACC greatly enhances the longitudinal control of the driver, reducing acceleration variation by about 45% compared to normal following, which will establish environmental benefits.- There may be added value to smoothing flow with Variable Speed Limits when significant ACC penetration exists. VSL reduces lane changing and creates smoother driving conditions better suited to ACC.- A long term monitoring study should be undertaken to examine potential changes in driver motivation and driver skill on the network brought about by ACC. Safety benefits are estimated due to the improvement in reaction times that ACC will offer. However, some concerns exist regarding driver's ability to resume control in an emergency situation and the potential for drivers to recognize these situations later.- The effects of further penetration of ACC will depend upon the time headway selected by drivers. Currently, headways of 1.2seconds and below are estimated to be required to avoid reducing capacity. It may not be desirable to encourage long platoons of vehicles with an inhomogeneous mix of vehicles, with different levels of maintenance and different control algorithms to operate in the fast lane.- A headway of 1.2 seconds is currently below that recommended by national administrations for safe driving. Investigations into the legal implications of ACC have indicated that this may make the burden of proof of negligent driving easier on ACC equipped drivers involved in an incident compared to manual drivers using the same headway. It may be necessary for national administrations to modify the driving code of practice to take account of the improved vehicle and control technology.- The automated highway concept continues to provide interest because of the potential capacity increases and safety benefits it may offer. However, the paths to developing dedicated infrastructure are not clear and will be the subject of further research in Framework 5. The legal considerations in developing the automated highway are considerably more complex than with driver assistance systems.- The application of telecommunications technology to pass information from and to a vehicle has been identified as having potential to replace some of the fixed-infrastructure technologies currently deployed. Whilst the functionality of systems such as AID will remain, the methods of data collection (probe-vehicle) and data dissemination (in-vehicle displays) may evolve.
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