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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

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Presentation Transcript
Nicolas hauti re marie line gallenne

Contribution of Infrastructures upon Road Safety: Modeling and Regulation of Operating Vehicle Speeds

Nicolas Hautière

Marie-Line Gallenne


Overview
Overview and Regulation of Operating Vehicle Speeds

  • 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
Context and Motivations and Regulation of Operating Vehicle Speeds

  • 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
Range of Infrastructure-Based Solutions and Regulation of Operating Vehicle Speeds

  • Road design and maintenance

  • Static road signs

  • VMS

  • Embedded VMS

Intrusive

Interactive


Underlying processes
Underlying Processes and Regulation of Operating Vehicle Speeds

  • 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
Vehicle Infrastructure Integration and Regulation of Operating Vehicle Speeds

  • 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: and Regulation of Operating Vehicle Speeds

Instrumented vehicles

Monitoring of Road Usage Instrumentation and measurement of trajectories

Perspectives: data fusion between the different methods.


Collection and update of road characteristics
Collection and Update of Road Characteristics and Regulation of Operating Vehicle Speeds

  • 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 and Regulation of Operating Vehicle Speeds

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?

Modeling of Road Usage

  • Calibration of reference speed models, e.g. the SAVV model:

Speed estimated by SAVV model, V85th speed and legal speed limit

Speed

Operation

Data

Curvilinear abscissa (m)


Toward adaptive speed limits detection of safety critical events
Toward adaptive speed limits and Regulation of Operating Vehicle SpeedsDetection 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


Nicolas hauti re marie line gallenne

Speed computation and Regulation of Operating Vehicle Speeds

Solve speed to get a the same risk as in normal conditions

Toward Adaptive Speed LimitsComputation of Relevant Contextual Speeds

  • Highway risk

Probability of fatal injury (%)

Speed

Braking distance (m)

Probability of occurence x gravity

Probability of fatal injury (%)

Probability of fatal injury (%)

risk

Braking distance (m)

Braking distance (m)


Nicolas hauti re marie line gallenne

Toward Adaptive Speed Limits and Regulation of Operating Vehicle SpeedsComputation of Contextual Speeds

Perspectives

  • Advisory speed limits or standardized advisory speed limits? HMI?

  • Traffic and vehicle class,

  • Driver profile estimation

Reference speed, advisory speed and stopping distance speedwith reduced friction and visibility

Speed

Curvilinear abscissa (m)


Global system overview
Global System Overview and Regulation of Operating Vehicle Speeds


Its framework architecture
ITS Framework Architecture and Regulation of Operating Vehicle Speeds


Conclusion and perspectives
Conclusion and Perspectives and Regulation of Operating Vehicle Speeds

  • 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