Fog Computing

Road safety remains a major concern due to delayed driver response to critical traffic signs, especially under low visibility or high-distraction conditions. This paper presents a Real-Time Vehicular Road Sign Alert System based on a GPS-enabled fog computing architecture. The proposed system uses an ESP32 microcontroller as a local fog node to process vehicle position data obtained from a GPS module. Instead of relying entirely on cloud processing, the system stores predefined road sign coordinates in local memory and performs real-time distance comparison using geofencing techniques. When the vehicle enters a predefined radius of a stored road sign location, the system instantly generates audio and visual alerts to notify the driver. Event data is optionally transmitted to a cloud server through a GSM module for logging and monitoring purposes. By shifting computation to the fog layer, the system achieves low latency, reduced bandwidth usage, and improved reliability in areas with limited network connectivity. The proposed solution provides a cost-effective and scalable approach to intelligent transportation safety systems.