The Internet of Things (IoT) for smart transportation is a rapidly growing research area aimed at improving traffic efficiency, safety, and sustainability through interconnected vehicles, infrastructure, and sensors. Research papers in this domain focus on applications such as intelligent traffic management, real-time vehicle monitoring, predictive maintenance, autonomous driving support, route optimization, and smart parking systems. Key contributions include vehicle-to-everything (V2X) communication, edge/fog computing for low-latency decision-making, AI-driven traffic prediction, blockchain-based secure data sharing, and context-aware routing. Recent studies also address challenges such as scalability, interoperability, cybersecurity, energy efficiency, and integration with 5G/6G networks for ultra-reliable low-latency communication. By combining IoT technologies with advanced analytics and intelligent transportation systems, research in IoT-smart transportation aims to create safer, more efficient, and sustainable urban mobility solutions.