Autonomous vehicles (AVs) are poised to transform industries like transportation, urban planning, and insurance by enhancing efficiency, safety, and sustainability. Our research focuses on AI-Based Vehicle Security, Smart Platooning for optimized traffic flow, and Intelligent Traffic Management using AI and IoT. We also explore Cooperative Autonomous Driving for real-time vehicle collaboration and Advanced Navigation and Perception for improved accuracy. Additionally, we investigate 5G/6G-V2X integration to enable ultra-low latency communication between vehicles and infrastructure, building resilient, scalable, and intelligent AV systems for future smart cities.