Latest highway to Nakhon Ratchasima to be available starting Songkran Festival The Department of Highways of Thailand is set to unbar the latest motorway on April 9 to 19, to relieve traffic congestion amidst the Songkran Festival 2021. According to Director Chitpol Lao-an of the 35 kilometer road which is the Area 2 Highway will be made available for one-way traffic linking Pak Chong District and Si Khiu District.