nicolas hautière marie-line gallenne
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Contribution of Infrastructures upon Road Safety: Modeling and Regulation of Operating Vehicle Speeds. Nicolas Hautière Marie-Line Gallenne. Overview. Context and Motivations Range of Infrastructure-Based Solutions Underlying technical processes Collection and update of road characteristics - PowerPoint PPT PresentationTRANSCRIPT
Contribution of Infrastructures upon Road Safety: Modeling and
Regulation of Operating Vehicle Speeds
Nicolas Hautière
Marie-Line Gallenne
Overview
• Context and Motivations
• Range of Infrastructure-Based Solutions
• Underlying technical processes– Collection and update of road characteristics– Monitoring and modeling of road usage– Computation of adaptive speed limits
• Perspectives
Context and Motivations
• Speed enforcement led to a drastic reduction of accidents on the different road networks
• Inspection and audit procedures have been standardized at the EU level, but are restricted to main roads
• The proportion of accidents is increasing on the secondary road network
• Solutions must be found for this network which has the following particularities:
Vehicle dynamics more demanding Less traffic density Bigger diversity of vehicles: LV, HGV, PTW, bikes,
agricultural vehicle, etc.
Range of Infrastructure-Based Solutions
• Road design and maintenance
• Static road signs
• VMS
• Embedded VMS
Intrusive
Interactive
Underlying Processes
• Diagnostic Monitoring and modeling of road usage Collection and update of road characteristics
• Operation Detection of safety-critical events Computation of relevant speed limits
• Regulation and standardization for deployment
Photo credit: tasosk
Vehicle Infrastructure Integration
• The development of ITS offers a relevant solution for secondary road networks
• ITS allows interconnecting maintenance centers, OBU, sensors using ITS Stations (RSU).
Monitoring of Road Usage Instrumentation and measurement of trajectories
• Static devices, e.g. the OdT system:
• Instrumented vehicles
Perspectives: data fusion between the different methods.
Collection and Update of Road Characteristics
• Today, data collection is performed by maintenance vehicles
• Tomorrow, the use of probe vehicles will emerge
• Development of cooperative Decision Support Systems (DSS)
Modeling of Road Usage
Perspectives • Deployment of reference
speeds on a road network
• Update of posted speed limits
• Still open questions• Only in normal conditions?• Single speed?• Pessimistic or realistic?
• Calibration of reference speed models, e.g. the SAVV model:
OperationData
Speed estimated by SAVV model, V85th speed and legal speed limit
Spe
ed
Curvilinear abscissa (m)
Toward adaptive speed limitsDetection of Safety-Critical Events
• Development of in-vehicle or roadside devices, e.g. camera-based detection of rain or fog episodes
• Development of prediction models, e.g. water layer thickness (WLT) or skid resistance (SR) models
• Speed computation– Solve speed to get a
the same risk as in normal conditions
Toward Adaptive Speed LimitsComputation of Relevant Contextual Speeds
• Highway risk
Probability of occurence x gravity
risk
Braking distance (m)
Braking distance (m)
Braking distance (m)
Pro
bab
ility
of
fata
l in
jury
(%
)
Pro
bab
ilit
y o
f fa
tal
inju
ry (
%)
Pro
bab
ilit
y o
f fa
tal
inju
ry (
%)
Spe
ed
Perspectives• Advisory speed limits or
standardized advisory speed limits? HMI?
• Traffic and vehicle class, • Driver profile estimation
Toward Adaptive Speed LimitsComputation of Contextual Speeds
Curvilinear abscissa (m)
Spe
ed
Reference speed, advisory speed and stopping distance speedwith reduced friction and visibility
Global System Overview
ITS Framework Architecture
Conclusion and Perspectives
• Validation of legal and adaptive speed limits computation tools on a panel of drivers
• Standardization and deployment on networks• Agenda
2005-2010: Scientific foundations 2011: Technical consolidation 2012-2015: Deployment and validation at a medium scale 2015+: Standardization and deployment at bigger scale
The DRAVIA project“Advanced Diagnostic of Networks for Relevant Speeds”
Diagnostic de Réseau Avancé pour des VItesses Adaptées