 It is a one-way street from Brisbane Street to Newcastle Street, from which point until its terminus at The Esplanade it has been progressively converted to two-way since 2008.Its route takes it through the Northbridge cafe and nightclub district as well as the CBD.A ramp which took William Street traffic from The Esplanade onto the southbound Kwinana Freeway was closed in 2004 during the construction of the Esplanade railway station.