Moreover, highway No 4184 (or Sadao-Ban Wangprajan) is the highway that links Thailand and
Malaysia, starting at Sato junction to the border at Ban Wangprajan for 22 km. In Malaysia side,
it starts from the border at Ban Wangprajan to Padang Besar and then to Penang for 61 km, or
from Ban Wangprajan to Ka-nga in Perlis state for 36 km and then to Penang for 130 km.