Transurban investors are optimistic the motorway road group’s preferred option will be a bargaining chip in Sydney’s toll fare overhaul as the company nuts out the details of the negotiation terms with the NSW government.

The tollroad company has been briefing analysts that a framework for the negotiations with the state for a tolling overhaul in Sydney, where drivers spend some $2.5 billion every year paying for privatised roads, is likely in the short to medium term.