How much safer, smoother, and more efficient could driving be if cars could communicate with traffic lights while approaching an intersection, get alerted to jaywalking pedestrians, or talk to each other while roaring down the highway at 65 miles per hour? A peer-to-peer wireless technology called C-V2X can warn vehicles about obstacles that cameras and radars might not catch, connecting them to their surroundings in a way that could eventually help them drive themselves. Most of the demos involve people driving cars and trucks outfitted with special C-V2X chipsets and modems. The vehicles send and receive wireless signals 10 times per second and display certain types of information--such as warnings about oncoming pedestrians, storms, and accidents--as pop-up alerts on drivers' windshields or dashboards. The most recent C-V2X demonstration, which took place in Colorado on August 14, also connected participating vehicles to traffic lights, so drivers knew exactly when the lights would change colors.