C-Roads

The C-Roads Platform is a joint initiative of European Member States and road operators for testing and implementing C-ITS services in light of cross-border harmonisation and interoperability. The Local Actor API v2 implements the C-Roads IP Based Interface Profile for backend communication between C-ITS actors.

C-Roads Platform Overview

The C-Roads Platform enables vehicles to interact directly with each other and the surrounding road infrastructure through:

Vehicle-to-vehicle (V2V) communication
Vehicle-to-infrastructure (V2I) communication
Cross-border C-ITS services for road users

Relationship to Local Actor API v2

The Local Actor API v2 implements the C-Roads IP Based Interface Profile specifications, specifically:

Basic Interface (BI) Implementation

AMQP 1.0 messaging protocol for C-ITS message exchange
TLS 1.3 session-level security with mutual authentication
JMS-style selectors for message filtering and capability selection
QuadTree-based geographical location specification
Support for C-ITS message types: DENM, IVIM, SPATEM, MAPEM, SREM, SSEM, CAM

Security and Governance

X.509 certificate-based authentication
Trust domain management through governing body
Certificate chain validation for secure communication
Support for both bilateral agreements (BI-BI) and interchange entities (BI/II)

Deployment Models

The Local Actor API v2 supports both C-Roads deployment approaches:

Decentralized Approach (Model A)

Direct point-to-point connections between C-ITS actors
Multiple logical connections for information sharing
Distributed architecture

Centralized Approach (Model B)

C-ITS actors connect through Interchange Entities
Interchange entities interconnect with each other
Centralized routing and data distribution

Standards Compliance

The Local Actor API v2 ensures compliance with:

C-Roads IP Based Interface Profile v2.1.0
AMQP 1.0 (ISO/IEC 19464:2014)
TLS 1.3 (RFC 8446)
X.509 PKI (RFC 5280)
QuadTree geographical indexing