1  Definition

Road Attributes is a Data Type describing the structural, regulatory, and usage‑related characteristics of a Road Segment as required by the Autonomous Motion Subsystem (AMS) for Motion Planning, Risk Assessment, and Trajectory Feasibility analysis.

2  Functional Requirements

The Road Attributes include, at minimum, the following:

  • NumberOfLanes – the count of physically designated lanes.
  • Length – linear extent of the road segment.
  • Width – nominal road or lane width.
  • MaxSpeed – maximum regulated speed.
  • MinSpeed – minimum regulated speed when applicable.
  • MaxHeight – maximum clearance allowed.
  • MaxWeight – maximum permitted vehicle gross weight.
  • LaneUsage – direction of travel allowed (e.g., forward, backward).
  • Category – functional classification (e.g., oneway, toll, link).
  • Types – structural road type (e.g., highway, street, avenue, boulevard, lane).

The AMS may use Road Attributes for Road State integration, route feasibility assessment, safe trajectory generation, and for verifying regulatory constraints such as lane direction, speed limits, and vehicle admissibility based on height or weight.

3  Syntax

https://schemas.mpai.community/CAV2/V1.1/data/RoadAttributes.json

4  Semantics

Label Description
Header Road Attributes Header – Standard “CAV‑RDA‑V”.
RoadAttributesID Identifier of the Road Attributes instance.
RoadAttributesTime Time of provision of the Road Attributes.
RoadAttributes Set of Road Attribute Data
– NumberOfLanes number of lanes.
– Length length of the road segment.
– Width road width or lane width depending on configuration.
MaxSpeed maximum permitted vehicle speed.
– MinSpeed minimum permitted speed.
– MaxHeight maximum allowable vehicle height.
– MaxWeight maximum allowable vehicle weight.
– LaneUsage one of forward, backward.
– Category one of oneway, toll, link.
– Types one of highway, street, avenue, boulevard, lane.
DataExchangeMetadata
Metadata optionally supporting regulated data exchange.
Trace Provenance trace including Source and Time per AIF V3.0 rules.
DescrMetadata Descriptive Metadata.

 

Label Description
Header Road Attributes Header – Standard “CAV‑RDA‑V”.
RoadAttributesID Identifier of the Road Attributes instance.
RoadAttributesTime Time of provision of the Road Attributes.
RoadAttributes Set of Road Attribute Data:

  • NumberOfLanes – number of lanes.
  • Length – length of the road segment.
  • Width – road width or lane width depending on configuration.
  • MaxSpeed – maximum permitted vehicle speed.
  • MinSpeed – minimum permitted speed.
  • MaxHeight – maximum allowable vehicle height.
  • MaxWeight – maximum allowable vehicle weight.
  • LaneUsage – one of forward, backward.
  • Category – one of oneway, toll, link.
  • Types – one of highway, street, avenue,
    boulevard, lane.
DataExchangeMetadata Metadata optionally supporting regulated exchange of the Road Attributes.
Trace Provenance trace including Source and Time per AIF V3.0 rules.
DescrMetadata Descriptive Metadata.