Transportation IoT - Something V2X (Vehicle-to-Vehicle or Vehicle-to-Infrastructure)
V2X technology allows vehicles to communicate with the traffic system around them. V2V (vehicle to vehicle) allows vehicles to communicate with other vehicles. V2I (vehicle to infrastructure) allows vehicles to communicate with streetlights, buildings, and even cyclists or pedestrians. V2X is mainly geared toward safety but also allows V2X system integration with tolls, parking, et al.
Problem to solve: Don't get killed by a Tesla while crossing the street
Product: Turn any iPhone into a V2X device