BANGKOK, Dec. 6 (Xinhua) — The southern extension of Bangkok’s Green Line opened to public on Thursday with Thai Prime Minister Prayut Chan-o-cha attending the opening ceremony.

The 13-km extension, with nine elevated stations, connects capital Bangkok with Samut Prakan province in the capital’s eastern suburb.

Commuters can enjoy a month free ride from Dec. 6.

During the opening ceremony, Prayut said that the project is a important one for connecting Bangkok and provinces around as it will bring convenience to commuters and also alleviate traffic problems in the capital.

The construction of the southern extension of Bangkok’s Green Line began in 2012 and was totally completed lately.