The 31st bridge connecting the north and south of Seoul's Han River World Cup Bridge is now complete after 11 years and will open on September 1st.
On the same day, the Seobu Underground Expressway opens as well.
Currently, around 120-thousand vehicles use the Seobu Expressway each day, but with the opening of the underpass, 50-thousand are forecast to disperse to the underground expressway.
Officials say an average 30 minute commute will take just 10 when the new road opens.
For the first two weeks, the underpass will be free, but after that, a toll of around two U.S. dollars will be charged.