▁Th ani ▁- ▁Th ung ▁Song ▁- ▁Ph at th al ung ▁was ▁constructed , ▁Route ▁ 4 0 3 ▁from ▁Su an ▁Pak ▁j unction ▁to ▁Ch ong ▁K ha o ▁j unction , ▁which ▁is ▁the ▁section ▁that ▁cross ▁the ▁mountain , ▁was ▁re assign ▁as ▁part ▁of ▁Route ▁ 4 1 . ▁ ▁List ▁of ▁Inter section ▁N akh on ▁Si ▁Th am mar at ▁Province ▁( Start ▁ 1 st ▁section ) ▁R atch ad am nu en ▁R d . ▁( n orth ward ▁to ▁N akh on ▁Si ▁Th am mar at ), ▁Route ▁ 4 0 8 ▁( s outh ward ▁to ▁Am ph oe ▁Ch alo em ▁Ph ra ▁K iat , ▁Song kh la ▁Province ), ▁Route ▁ 4 0 1 3 ▁( east ward ▁to ▁Am ph oe ▁Pak ▁Ph an ang ) ▁Route ▁ 4 1 0 3 ▁( n orth ward ▁to ▁Am ph oe ▁Th a ▁S ala , ▁south - east ward ▁to ▁Am ph oe ▁Ch alo em ▁Ph ra ▁K iat , ▁Song kh la ▁Province ) ▁Route ▁ 4 2 3 8 ▁( n orth - west ward ▁to ▁Am ph oe ▁Lan ▁S aka ) ▁Route ▁ 4 0 1 8 ▁( s outh ward ▁to ▁Am ph oe ▁Ch ul ab horn ) ▁( End ▁ 1 st ▁section ) ▁Route ▁ 4 1 ▁# 1 ▁( west ward ▁to ▁Am ph oe ▁Th ung ▁Song , ▁Sur at ▁Th ani ▁Province , ▁east