Collision Avoidance System Using Li-Fi-based V2V Communication

Abstract

Li-Fi sends data through visible light—fast and without wires. In today’s smart transportation setups, cars require reliable methods of communication with one another. This helps avoid crashes, eases traffic jams, and boosts self-driving technology. Old radio-style links like Wi-Fi or Bluetooth hit roadblocks. They deal with crowded signals, noise issues, lag spikes, plus security risks. To fix those problems, we are testing a new car-to-car link built on Li-Fi. It lets vehicles swap critical alerts using bright LEDs to send tiny sensors to catch. In the setup described, one car sends information like braking action, warnings about obstacles, current speed, or turning signals by flashing an LED. Instead of sending data together, it is turned into quick bursts of light that carry each piece separately. Another car picks up those flashes using a small sensor called a photodiode. Then, a tiny computer chip on board figures out what the signal means. Because this method relies on direct visibility and regular light, there is less delay, fewer outside disruptions, and better security. Tests found that swapping a smaller 5 mm bulb for a larger 10 mm version boosts brightness significantly. That change stretches how far the message can go while making the link more stable. Best part? You don't need to rewrite any software to get these gains. This research shows Li-Fi could work well for close-range vehicle-to-vehicle links without draining power or budget. It sends info instantly, which helps things like emergency stops, preventing crashes, or smoother traffic flow. Instead of replacing current methods, this setup might boost them—opening doors to tougher, safer transportation networks.