In August 2020, testing of the first automatic Platform screen doors (Rope-type Screen Door) commenced at the Vasil Levski Stadium Metro Station of the Sofia Metro. These safety barriers are intended for greater safety of passengers. Automatic partition doors on the existing Line 1, in addition to the Vasil Levski Stadium Metro Station, are also being built at the Opalchenska Metro Station. By 2022, this RSD system will be implemented at first 12 stations of the Line 1 and Line 2 of the Sofia Metro. [3]