Empirical results from a 50-intersection smart corridor deploying SPaT/MAP broadcasts to connected commuter fleets.
Up to 30% of urban vehicle fuel consumption is wasted coming to complete stops at red lights and subsequently accelerating back to cruising speed. Traditional traffic signals operate on fixed time-of-day tables, oblivious to approaching vehicle platoons.
SmartV2X integrates with Advanced Traffic Controllers (ATC) to broadcast Signal Phase and Timing (SPaT) and Intersection Geometry (MAP) messages. Approaching vehicles calculate an optimal target velocity envelope (e.g., 'maintain 42 km/h to catch the green window'), eliminating hard braking and prolonged idling. ``` +-----------------------+ PC5 / SPaT +-----------------------+ | Traffic Signal RSU | --------------------------------> | Approaching Vehicle | | "Green in 6.2s for 22s"| | Target: 38 km/h Coast | +-----------------------+ +-----------------------+ ```
In a 14-month deployment across downtown Copenhagen, connected vehicles achieved a 22% reduction in stop events, a 16% reduction in NOx emissions, and a 12% improvement in overall corridor throughput.