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

Nicolas Hautière

Marie-Line Gallenne

  • 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
  • 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
  • Road design and maintenance
  • Static road signs
  • VMS
  • Embedded VMS



underlying processes
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
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

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
  • 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

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




Curvilinear abscissa (m)

toward adaptive speed limits detection of safety critical events
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 fatal injury (%)


Braking distance (m)

Probability of occurence x gravity

Probability of fatal injury (%)

Probability of fatal injury (%)


Braking distance (m)

Braking distance (m)


Toward Adaptive Speed LimitsComputation of Contextual Speeds


  • 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


Curvilinear abscissa (m)

conclusion and perspectives
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