Which innovative IoT technology is being used in 'smart highways' to dynamically adjust speed limits based on real-time traffic conditions and weather?

The transportation industry is increasingly adopting Internet of Things (IoT) technologies to create smarter, safer, and more efficient travel experiences. From connected vehicles to intelligent infrastructure, IoT is revolutionizing how we move people and goods. This trivia question focuses on one cutting-edge IoT implementation that's changing our highways. Test your knowledge about how transportation and technology are converging to create the roads of tomorrow.

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Variable Message Signs (VMS) with integrated environmental sensors and AI-powered traffic flow algorithms
Blockchain-based toll collection systems that automatically adjust pricing during peak hours
Solar-powered road studs that change color to indicate lane availability
Autonomous drones that hover above highways to direct traffic during congestion