5G -Based Intelligent Vehicle Communication Using Lightweight Blockchain for Accident Detection and Emergency Alert.

Road accidents require timely detection, dependable emergency notification, and reliable handling of incident records. This paper presents a prototype-oriented approach combining an embedded accident- alert unit, a cloud-connected hospital portal, a hash-linked database audit mechanism, and a separate MATLAB-based 5G link simulation. The hardware prototype uses an ESP32-S3 EC200U development board and an MPU6050 inertial sensor. SOS button and cancel SOS button is provided user needs to press any one of the buttons, after a detected event, a 30-second cancellation window allows a false alarm to be cancelled, the system submits event information to Supabase over Wi-Fi and sends SMS alerts through the cellular module. The hospital portal provides staff authentication, role-based access, accident-status management, notifications, and a PostgreSQL/Supabase hash-linked audit trail with chain-verification functions. Separately, MATLAB with 5G Toolbox is used to simulate an example communication link; the simulated alert data are not streamed from the physical hardware. The reported audit test returned "CHAIN AND CHECKPOINTS VERIFIED." The supplied BER/BLER values are illustrative and are not treated as reproducible measured performance. The work therefore demonstrates integration of an accident-alert prototype live accident location GPS coordinates, cloud-based incident management, database audit verification, and an independent 5G simulation.