| Country: | KOR |
| Type: | EX |
| Route: | 171 |
| Map: | 171 Osan-Hwaseong.svg |
| Length Km: | 2.55 |
| Established: | October 29, 2009 |
| Direction A: | East |
| Terminus A: | Osan, Gyeonggi-do |
| Direction B: | West |
| Terminus B: | Hwaseong, Gyeonggi-do |
| Cities: | Hwaseong, Osan |
Osan–Hwaseong Expressway (Korean: 오산화성고속도로,, 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 Osan–Hwaseong Expressway.[1] On October 29, 2009, all routes were started through the West Osan Junction- Annyeong Tollgate.[2]
| No. | Name | Korean Name | Hanja Name | Connections | Notes | Location | |
|---|---|---|---|---|---|---|---|
| 6 | 서오산 분기점 | 西烏山分岐點 | JC | Osan, Gyeonggi | |||
| 7 | 서오산 요금소 | 西烏山料金所 | - | TG | |||
| 8 | 안녕 나들목 | 安寧 | IC | Hwaseong, Gyeonggi |