Splitting your time between Taipei and Ilan is finally a practical reality. The Taipei-Ilan Expressway, which runs from Nankang in Taipei through to Toucheng in Ilan, is officially a section of National Highway No. 5 (to run from Nankang to Taitung), and runs for 55 kilometers.
北自台北南港、南至宜蘭蘇澳的北宜高速公路，是「國道 5 號計畫」（南港至台東）中的一段；為了紀念宜蘭出身的台灣民主鬥士蔣渭水，故也稱為「蔣渭水高速公路」。