Highway 3222 leads south from Kaeng Khoi town to Ban Na in Nakhon Nayok province, and will provide access to the under-construction (as of 2022) Motorway 6 towards Bangkok and Nakhon Ratchasima.
Highway 3222 begins at Kaeng Khoi town and travels south to Ban Na in Nakhon Nayok province, connecting to the upcoming Motorway 6 which will lead to Bangkok and Nakhon Ratchasima.