The Jungbu Naeryuk Expressway(literally means Central Inland Expwy.) is a freeway in South Korea. Numbered 45, it was first constructed in three parts: connecting Yeoju to Chungju and Sangju to Gimcheon and Hyeonpung to Masan. The part of the expressway between Chungju and Sangju was completed at the end of 2004, with the last remaining section being that between Gimcheon and Hyeonpung. The Jungbu Naeryuk Expressway Branch Line(aka as Guma Expressway) is route number 451, and connects Hyeonpung to N.Daegu.
The Speed Limit is from Exit 1 to Exit 13(Masan- Gimcheon): Maximum is 100 km/h, and minimum is 50 km/h. North of exit 13, until exit 28, (Gimcheon-N.Yeoju), The Maximum speed limit is 110 km/h. minimum is 50 km/h.