In order to deal with the high number of passengers in transfer stations, Metro is studying the possibility of building pedestrian connections between nearby core transfer stations. For example, a passage between Metro Center and Gallery Place stations would allow passengers to transfer between the Orange/Blue/Silver and Yellow/Green Lines without going one stop on the Red Line. Another tunnel between Farragut West and Farragut North stations would allow transfers between the Red and Orange/Blue/Silver lines, decreasing transfer demand at Metro Center by an estimated 11%. The Farragut pedestrian tunnel has yet to be physically implemented, but was added in virtual form effective October 28, 2011. The SmarTrip system now interprets an exit from one Farragut station and entrance to the other as part of a single trip, allowing card holders to transfer on foot without having to pay a second full fare.