The OsanâÂÂHwaseong Expressway (; part of Expressway 171) is an expressway in South Korea that runs between Osan and Hwaseong. Established on October 29, 2009, it is the shortest expressway in South Korea with a length of 2.55 kilometers (1.58 miles). It shares its expressway number with Yongin-Seoul Expressway. However, they are not connected.
On January 3, 2008, the name was changed from Pyeongtaek-Hwaseong Expressway to Expressway No. 171 OsanâÂÂHwaseong Expressway. On October 29, 2009, all routes were started through the West Osan Junction- Annyeong Tollgate.