contribution of infrastructures upon road safety: modeling and regulation of operating vehicle...
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![Page 1: Contribution of Infrastructures upon Road Safety: Modeling and Regulation of Operating Vehicle Speeds Nicolas Hautière Marie-Line Gallenne](https://reader030.vdocuments.us/reader030/viewer/2022033107/56649e795503460f94b795a4/html5/thumbnails/1.jpg)
Contribution of Infrastructures upon Road Safety: Modeling and
Regulation of Operating Vehicle Speeds
Nicolas Hautière
Marie-Line Gallenne
![Page 2: Contribution of Infrastructures upon Road Safety: Modeling and Regulation of Operating Vehicle Speeds Nicolas Hautière Marie-Line Gallenne](https://reader030.vdocuments.us/reader030/viewer/2022033107/56649e795503460f94b795a4/html5/thumbnails/2.jpg)
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
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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.
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Range of Infrastructure-Based Solutions
• Road design and maintenance
• Static road signs
• VMS
• Embedded VMS
Intrusive
Interactive
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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
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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).
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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.
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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)
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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)
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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
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• 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
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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
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Global System Overview
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ITS Framework Architecture
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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