It is due to be completed in 1978. The 235-mile (373.4 kilometer) freeway will also be connected by branch lines to Taichung Port and the international airports at Taoyuan and Kaohsiung. Driving time for the whole distance will be between four and five hours.
路線大部份與現有西部幹線平行，全長約三百七十三點四公里，全部行程僅需四至五小時。