Abstract
After a reliable service, what passengers most need is reliable service information. To meet this need, transport authorities have spent much of the past two decades developing a variety of information systems, tracking individual vehicles and predicting arrival times at later stops. The publicresponse to this has been enthusiastic and positive. However, different technology approaches were being used by different authorities, meaning that bus services couldn't be tracked from one area to another. Coordination and standardisation was necessary, so the UK's passenger transport community established the Real Time Information Group, RTIG, discussed in detail in this article.