The O-Bahn Busway is a guided busway that is part of the bus rapid transit system servicing the northeastern suburbs of Adelaide, South Australia. The O-Bahn system was conceived by Daimler-Benz to enable buses to avoid traffic congestion by sharing tram tunnels in the German city of Essen.

Grenfell Street is a major street in the north-east quarter of the Adelaide city centre, South Australia. The street runs west-east from King William Street to East Terrace. Its intersection with Pulteney Street is formed by Hindmarsh Square. On the west side of King William Street, it continues as Currie Street towards West Terrace.