The NSW government is limiting traffic from public roads in favour of motorists using the private WestConnex at a $3.9 billion interchange in Sydney’s inner west under a deal struck with Transurban last month.

Some market analysts also believe Transurban, the operator of the road, will have a separate, guaranteed right to two of the four lanes across the Anzac Bridge, an important link from the west into the Sydney CBD. However, neither the ASX-listed toll road operator nor the government would confirm what was in the agreements regulating the busy interchange.