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Urban Road Safety How to deal with complexity? D. Fleury – INRETS Conference Physics and the City. Bologna 15-17 December 2005. Department of Accident Mechanisms (INRETS) Research in the field of Road Safety
How to deal with complexity?
D. Fleury – INRETS
Conference Physics and the City.
Bologna 15-17 December 2005
In Depth Accident Investigation (IDAI)
Études détaillées d’accidents (EDA)
Specific research issues based on system analysis
Man (driver-pedestrian) regulates the (M/V/R) system in real time
Macro-regulation and social management of safety
Regulation performed in “response” delay time, with the observation of user behaviour (driving speeds, accidents, perceived risks, opinions, etc.)
Baker and Fricke (1986)
network and choice of
characteristics of the
carriageway and section
break related to a section
or particular location
(intersection, for example)
fine characteristics of the
Emergency and collision situations
Accident analysis, not restricted to immediate interaction, leading to actions for treating black spots as well as town planning and transportation policy.
Wide through road, problems of visibility (night, wetness, age, advertising, etc.)
High speed, low attention
Pedestrian preparing to cross outside a pedestrian crossing
View obstructed by a standing vehicle, the pedestrian crosses
No manoeuvre (surprise)
1. Construction of “scenarios” on a panel of accidents
2. Scenarios recognition through police reports (and accident files)
Structure of the knowledge field
Symptoms (data) for recognition
3. Links between road environment and accident scenarios
Scenarios profiles (% of each scenario)
Systems with decision-making and memory centres (ref.: Boulding)
On the role of memorisation.
Rasmussen model (1980), level of cognitive operation: problem, procedural and automation resolution.
On decision-making and motivation.
Urban Travel Plan design (Plans de Déplacements Urbains)
Law on the Air and Rational Energy Use – 1996
Law on Solidarity and Urban Renewal – 2000
Follow-up work meetings for nearly one and a half years
Construction of a “reference project” by clustering "operational projects":
Three main scenarios:
Referring to an "island strategy" concerning automobile traffic
Safety research entails modelling
Different levels of representations of unsafe situations
Both aspects: techniques and decision making
How to make explicit the models of action
Stressing the “unspokens” of planning (importance of Ring roads, forgetting mopeds and motocycles, etc.)
The possible consequences on safety (accident scenarios)