Subject Interface REST API

The Subject Interface REST API provides operational endpoints for managing streaming sessions, subjects (TLCs), and authorization. Resources are automatically scoped to your domain and account context.

TLC Terminology

The interface originally served Traffic Light Controllers (TLCs), and this legacy terminology persists in the API specifications for backward compatibility. "TLC" now refers to any connected entity: traffic controllers, sensors, barriers, displays, or any C-ITS participant. See Terminology Reference for the mapping between legacy and generic terminology.

Getting Started

New to the Subject Interface API? Start here for quick implementation:

• Quick Start Guide - 15-minute implementation walkthrough
• Common Workflows - Step-by-step task guides

Quick Reference

Fast access to essential information:

• API Endpoints Reference - Concise endpoint documentation
• Endpoint Permissions Matrix - Role capability reference
• OpenAPI specification - OpenAPI 3.0 specification