Busan Subway Line 4 (4호선) is a rubber-tyred metro line of the Busan Subway network that connects part of Gijang-gun, Busan, and upper Haeundae-gu, Busan, into Dongnae-gu, Busan Korea. It is operated by the Busan Transportation Corporation. Opened on March 30, 2011, the line is a rapid transit (metro) system consisting of 14 stations - 8 underground, 1 on-ground, and 5 above-ground. The line color is blue. A trip through the entire line takes about 24 minutes.