Roadway Environment

This terminator represents the physical condition and geometry of the road surface and the conditions surrounding the roadway. The geometry of the roadway and the road surface characteristics must be sensed and interpreted to support automated vehicle control services. Surrounding conditions may include fog, ice, snow, rain, wind, etc. which will influence the way in which a vehicle can be safely operated on the roadway. The condition of the roadway must be monitored by the architecture to enable corrective action and information dissemination regarding roadway conditions which may adversely affect travel. This physical interface carries these physical condition and geometry attributes which must be sensed, interpreted, and processed by functions internal to the system to achieve ITS User Service functionality.

Inputs/Outputs: Architecture Flows and Data Flows

Roadway Environment > Maintenance and Construction Vehicle

• environmental conditions - Current road conditions (e.g., surface temperature, subsurface temperature, moisture, icing, treatment status) and surface weather conditions (e.g., air temperature, wind speed, precipitation, visibility) that are measured by environmental sensors.
  Data Flows:
  • fre-environmental_conditions_at_roadway
  
  
• roadway characteristics - Detectable or measurable road characteristics such as friction coefficient and general surface conditions, road geometry and markings, etc. These characteristics are monitored or measured by ITS sensors and used to support advanced vehicle safety and control and road maintenance capabilities.
  Data Flows:
  • fre-roadway_infrastructure_characteristics
  • fre-roadway_characteristics_for_mcv
  
  

Roadway Environment > Roadway Subsystem

• environmental conditions - Current road conditions (e.g., surface temperature, subsurface temperature, moisture, icing, treatment status) and surface weather conditions (e.g., air temperature, wind speed, precipitation, visibility) that are measured by environmental sensors.
  Data Flows:
  • fre-roadway_infrastructure_characteristics
  • fre-physical_conditions
  • fre-environmental_conditions
  
  
• environmental hazards - Detection of specific localized hazards affecting the roadway, like mud slides, avalanches, high winds and flooding.
  Data Flows:
  • fre-roadway_environmental_hazards
  
  
• roadway characteristics - Detectable or measurable road characteristics such as friction coefficient and general surface conditions, road geometry and markings, etc. These characteristics are monitored or measured by ITS sensors and used to support advanced vehicle safety and control and road maintenance capabilities.
  Data Flows:
  • fre-roadway_characteristics
  
  

Roadway Environment > Vehicle

• environmental conditions - Current road conditions (e.g., surface temperature, subsurface temperature, moisture, icing, treatment status) and surface weather conditions (e.g., air temperature, wind speed, precipitation, visibility) that are measured by environmental sensors.
  Data Flows:
  • fre-environmental_conditions
  
  
• roadway characteristics - Detectable or measurable road characteristics such as friction coefficient and general surface conditions, road geometry and markings, etc. These characteristics are monitored or measured by ITS sensors and used to support advanced vehicle safety and control and road maintenance capabilities.
  Data Flows:
  • fre-roadway_characteristics
  • fre-roadside_data