Heavy traffic on Homebush Bay Drive is backed up onto the M4 motorway as far as James Ruse Drive, as motorists flock to DFO in Homebush for the Boxing Day sales.
One of three northbound lanes on Centenary Drive is closed at Arthur Street due to a car breakdown, resulting in heavy traffic in Homebush West.
People heading to DFO to take advantage of the sales are being urged to expect delays and exercise caution.
Delays began at about 8am on Monday, and are expected to last throughout the day alongside trading hours.
The Transport Management Centre advised that traffic was heavy on all approaches to DFO, particularly the Australia Avenue and Homebush Bay Drive intersection where it is backed up to the M4.
Underwood Road and Centenary Drive are also experiencing heavy traffic.
North of Sydney, traffic heading north on the M1 Pacific Motorway is heavy at Wahroonga, Mount White, Somersby and Mardi.
Heathcote is also experiencing heavy eastbound traffic on Heathcote Road, approaching the Princes Highway.
Northbound traffic on the Princes Highway is back to normal after a car and caravan accident near Nethercote Rd at Eden.
Traffic heading south along the Princes Highway at Berry remains queued around two and a half kilometres and motorists are being advised to allow around ten minutes extra travel time.
Heavy holiday traffic in several other locations around New South Wales has started to ease, including northbound traffic on the Pacific Highway at Woodburn and Macksville.
Traffic on the south coast has also reduced, with heavy southbound traffic having eased on the Princes Highway at Albion Park Rail.
Back in Sydney, carparks are full at Wattamolla and Garie Beach in the Royal National Park.
At a time when roads are crammed and motorists' patience tested, acting traffic and highway patrol commander Michael Corboy is warning road users not to speed.
"The cost of the traffic fines is a fraction compared to the risk to human lives by drivers travelling at excessively-high speeds," he said.
During the last 10 days, six people have died on NSW roads, which is five fewer than this time last year.
The number of traffic infringement notices for speeding offences issued, however, has increased by nearly 20 per cent to about 11,000 since mid-December - nearly 2000 more than last year.
Double demerit points will remain in place until Monday, January 2.
