As part of the North Sydney Traffic Management Plan, a section of Mount Street from Miller Street through to Denison Street was closed off to traffic for shoppers in North Sydney but also to separate the through traffic from the local traffic. Instead of using Mount Street to access the Warringah Expressway from the Pacific Highway, motorists would be diverted one block north at Berry Street. This arrangement remains today.
Source: Department of Main Roads (NSW). 1985. "North Sydney Traffic" (Advertisement). The Daily Telegraph, September 24:14-15.