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Content archived on 2024-04-19

Road Safety Enhancement System


Overall goal of ROSES is to reduce the number of traffic accidents under adverse weather conditions. The operational goal is the implementation of a fully integrated monitoring system for traffic, weather and road condition, to support drivers, traffic management and winter maintenance decisions.
The road safety enhancement system (ROSES) reduces the number of traffic accidents under adverse weather conditions. A fully integrated road and weather condition monitoring system is implemented on 2 pilot test sites and in a test vehicle.

A common approach for the quantification of safety margin has been specified both from a central point of view and from the in vehicle point of view. The user requirements for the ROSES pilot tests have been drawn up, specifying the data to be exchanged and the required communication facilities.

Forecasting methods have been developed: Crosswind forecasts were based on a limited area model and turned to the local conditions at vehicle level. Road surface conditions are predicted by a model taking into account radiation and turbulent transfer of heat and the reduced visibility range due to precipitation and spray is forecast by extrapolation of weather radar data.

An analysis method was developed for driver behaviour and driver response to information, warning and support strategies.

The relation between visibility range and driver behaviour (in terms of speed, distance, headway and time to collision) has been analyzed.
Technical Approach

In the ROSES project a fully integrated road and weather condition monitoring system is implemented on two pilot test sites and in a test vehicle.

In the Netherlands the ROSES system will take part in the test site for a General European Road Data and Information Exchange Network, which will provide the infrastructure for data handling. On sites in Wales ROSES focuses on the specific problems posed upon road management by severe wind conditions.

For the ROSES central system the concept for a local road and weather monitoring station, CCC, as developed in the DRIVE I project CROW will be used.

The combination of in-vehicle systems and a vehicle-roadside communication link will give the possibility to individually warn and support the driver with preview information of the conditions to be encountered ahead. Furthermore road and weather condition data measured from the side of the road and from the vehicle will be combined. The in-vehicle systems are strongly linked to the PROMETHEUS programme.

In a first phase the project started with a simultaneous survey of technological status and description of the user requirements for the pilots. This is followed by the design and a realisation phases, preceding the actual pilot test phase, which will be evaluated in a concluding phase.

To support the effectiveness of the pilot tests, special emphasis will be given to:

Driver behaviour and microscopic traffic behaviour under adverse weather conditions
Assessment of safety margin
Information systems (information, warning, support)
Tyre road interaction
Short term forecasting
Winter maintenance on porous asphalt.

Support work is carried out through simulation, in-door experiments (fixed base simulator) and controlled environment tests using research vehicles and test sites.

Key Issues

Improving traffic safety under adverse weather conditions.
Pilot tests for road side and in-vehicle monitoring of road and weather conditions.
Effective information to and support of drivers and road authorities
Winter maintenance support.

Expected Achievements

The algorithms for quantifying traffic safety will be further developed and extended based on the relations between microscopic traffic behaviour and external conditions. Strategies for in-vehicle warning and support will be developed. Tyre measurements will be used to fill the tyre-road interaction database. Recommendations for winter maintenance ice warning on porous asphalt will be drawn up. Road and weather monitoring systems will be implemented in a test vehicle and on pilot sites in the Netherlands and Wales. The pilot tests will result an evaluation of the safety impact of the ROSES system.

Expected Impact

The ROSES project is expected to result:

Improvement of traffic safety, specifically less accidents due to bad weather conditions, at the same time reducing and controlling traffic congestion.
Improved support of road authorities on traffic management and winter maintenance.
Driver support to adapt to road and weather conditions.


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Funding Scheme

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Participants (7)