Besides its commercial worth, the -Xinyi Line is also the second east-west line in the Taipei MRT system, and should take a lot of the rush-hour load off of the heavily trafficked Ban-nan Line. Most of the current routes of the system run north-south as they pass through downtown Tai-pei City.
商業價值之外，信義線也是台北第二條東西向的捷運線，可為上下班時段擁擠不堪的板南線紓解人潮。