Illawarra motorists have questioned whether a $15 million state government scheme to rename NSW's major roads based on an alphanumeric system is worth the money.
The project, begun in May this year, recently entered its second phase with motorways and the majority of national routes due to change between now and November.
In the Illawarra, the F6 Southern Freeway between Waterfall and Mount Ousley Road and then south to Yallah has already been named the M1 Princes Motorway.
To the north of Sydney, the F3 has become the M1 Pacific Motorway.
NRMA director David Bentham said the plan would bring NSW into line with Queensland and Victoria, who already use the alphanumeric format.
Truck driver Darren Sewalt, who travels throughout NSW and occasionally interstate, said changing road names shouldn't make navigating more confusing.
"It all depends on GPS because nine out of 10 people are using that," he said.
But he said the estimated $15 million cost could have gone to more worthy projects.
"The money should be spent in better places, just for a few street signs it doesn't seem worth it."
At Tuesday's budget estimates meeting, Roads and Ports Minister Duncan Gay trumpeted the government's ability to bring the estimated cost of the project down from $20 million to $15 million.
But he came under scrutiny from opposition MP Penny Sharpe when he was unable to identify a series of recently renamed highways.
Meantime, Roads and Maritime Services traffic and safety general manager Craig Moran said the changes would not affect emergency services' response times.
"RMS has consulted with emergency services, Destination NSW, tourist operators and mapping providers to ensure uniformity.
"We understand there may be some confusion as people get used to the new system but it will ultimately provide clearer directions for road users travelling along the eastern seaboard."