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SG Buses is easy to use and keep track of bus arrival time. Good when you are rushing for a meeting on budget but don't want to wait for too long on certain bus. Shortest route doesn't mean arriving the fastest >

Android version:  https://market.android.com/details?id=com.iridianstudio.sgbuses
iOS version: http://itunes.apple.com/tr/app/sg-buses/id289452185?mt=8