The recent advances of geo-positioning hardware, computer software and mobile communications have combined to offer new opportunities for improved public transport services. Today many transportation companies are using the Global Positioning System (GPS) and wireless communication systems (e.g. radio data systems or GSM/GPRS) for communicating their vehicle location information and other details to a central server (Predic et al 2007) (Kane, Verma and Jain 2008). By tracking their bus fleet in real-time, operators can monitor schedule adherence and service efficiency, give better operational support and provide users with real-time service information. There are several bespoke systems commercially available to do this.