V2I

V2I (Vehicle-to-Infrastructure) is a core communication architecture within the intelligent connected vehicle (ICV) and Internet of Vehicles (IoV) ecosystem. Operating via two-way wireless data transmission between vehicles and intelligent roadside infrastructure—such as smart traffic lights, roadside radar, cameras, electronic signboards, and roadside edge computing units (RSUs)—it allows vehicles to dynamically interpret and anticipate complex road conditions ahead. This technology serves as a vital foundation for achieving higher-level autonomous driving, easing urban traffic congestion, and enhancing road safety.

Core Technical Architecture and Operating Principles

The technical architecture of a V2I system primarily comprises in-vehicle terminals (OBU / T-Box), roadside infrastructure (RSU / roadside perception units), cellular vehicle-to-everything communication networks (C-V2X / 5G base stations), and cloud-based traffic management platforms: 

Roadside High-Frequency Sensing and Real-Time Traffic Broadcasting:

Roadside traffic infrastructure deployed at junctions or expressway stretches (such as gantries and poles fitted with cameras, LiDAR, and edge computing units) continuously monitors surrounding traffic flow, pedestrians, and traffic light signals around the clock. Roadside Units (RSUs) broadcast wireless data packets at ultra-high frequencies to nearby vehicles via Dedicated Short-Range Communications (DSRC) or Cellular Vehicle-to-Everything (C-V2X, such as PC5 direct communication). These packets contain Signal Phase and Timing (SPaT) data, road congestion indices, and real-time hazard alerts.

In-Vehicle Wireless Reception and Beyond-Line-of-Sight Safety Warnings / Automated Coordination:

Once the vehicle's OBU receives real-time data from the roadside, the on-board domain controller executes millisecond-level computations paired with the vehicle's precise positioning. Even when physical blind spots occur (such as traffic lights obscured by heavy lorries or a stalled vehicle around a blind bend), the in-cabin system can deliver preemptive beyond-line-of-sight safety alerts, such as "Green Wave Speed Advisory", "Red Light Ahead – Slow Down", or "Roadworks Ahead – Proceed with Caution". Selected smart models can even interface directly with autonomous driving systems to achieve seamless green-wave cruising. 

Safety Protocols and Physical Constraints

Strict Prohibition Against Blindly Relying on V2I During Infrastructure Failures, Network Downtime, or Cyber Attacks (Prohibiting Blind Reliance on V2I When Roadside Infrastructure Fails or Suffers Interference):

V2I relies heavily on stable two-way vehicle-to-infrastructure communication and the absolute reliability of roadside hardware. Drivers must never place blind faith in system prompts if the V2I link drops, exhibits noticeable latency, or suffers packet loss. Physical road signs, road markings, and instructions from traffic police on the ground must strictly take precedence at all times to prevent severe collisions caused by corrupted roadside data.

Strict Prohibition Against Ignoring Weather-Induced V2I Dropouts (e.g. Storm Damage or Obstructed Sensors) and Speeding Through Complex Junctions (Prohibiting the Disregard of V2I Disconnections Caused by Extreme Weather and Speeding Through Complex Intersections): 

Roadside sensing hardware is equally bound by environmental and physical limits. Drivers must never take corners at high speeds or beat traffic lights when roadside units fail and direct visual confirmation is unavailable. Without the protection of "beyond-line-of-sight" data feeds, motorists must revert to conventional visual driving or rely on fundamental ADAS safety features to ensure absolute driving safety.