Location: Route 4 and Tanon Songphol Rd, Nakhon Prathom Reassurance shield after the 3524 junction as we head out of Nakhon Prathom. Location: Route 4 and Route 323, Nong O A few clicks later, we’ll approach Route 323. Exit left for 323 west.  S to TH-3525, N to TH-3524  W to TH-3525  E to TH-321