Two fathers have been caught drunk behind the wheel with their children in the car, with police saying they're alarmed by a spike in drink-driving offences on New Year's Day.

Sixty-three drivers were caught over the blood-alcohol limit on Tuesday - 37 more than on the first day of 2012.

An unlicensed 33-year-old man was caught drink-driving at Riverstone, in Sydney's northwest, just before 6pm (AEDT), police said.

It's alleged the man, who had his five-year-old daughter with him in the car at the time, returned a breath-analysis reading of 0.090.

He has been charged with mid-range drink-driving and unlicensed driving.

In a separate incident, a 25-year-old Western Australian man was caught with his nine-year-old son in the car on the Princes Highway at Fairy Meadow, near Wollongong, about 9.30am (AEDT).

He returned a breath analysis reading of 0.093 and was charged with mid-range drink-driving, police said.

Meanwhile, a 49-year-old woman allegedly returned a breath-analysis reading more than five times the legal limit after being pulled over at Banora Point, on the state's far north coast, about midnight.

She has been charged with high-range drink-driving and her licence was confiscated.

Superintendent Bob Ryan, from Traffic & Highway Patrol Command, said the spike was "of extreme concern".

"It's simply alarming that despite all the safety warnings about the dangers of drink-driving there were 63 people that chose to get behind the wheel drunk," he said in a statement.

So far this holiday season, officers have breathalysed 447,230 motorists and charged 676 of them with drink-driving offences - 126 fewer charges than for the same period last year.

"It's obvious yesterday's spike in offences is the result of partygoers getting on the drink to welcome in the New Year and then jumping in the car and driving home," Supt Ryan said.

"It's incredibly irresponsible, dangerous and criminal that anyone would drive in that state."

Police also nabbed 690 speeding motorists on New Year's Day and issued 1212 fines for other traffic offences.