Updated April 21, 2017 23:06:50

Photo: There will be a large police presence in Sydney over the next five days. (AAP)

New South Wales police say they are well prepared for the weekend visit of US Vice-President Mike Pence, who has arrived in Sydney tonight.

Several exclusion zones are in place around the harbour city's famed landmarks ahead of Mr Pence's three-day Australian visit.

NSW Police Assistant Commissioner Mark Murdoch said police were working very closely with the US Secret Service during the visit.

"The US Secret Service take all overseas visits by their heads of state very, very seriously. So we are used to in NSW working very closely with the Secret Service to facilitate a safe visit by their parliamentary leaders," he said.

Mr Murdoch said there would be clearways in and around the Sydney CBD, Kirribilli, and Mosman from today until Monday, and he warned drivers there may be traffic disruptions caused by road closures.

"Those road closures will be put in place before the motorcade hits a particular area. As soon as the motorcade passes the road will be re-opened," he said.

"Safety is paramount for all road users. There will be some inconvenience and we apologise for that but again we just ask people to be patient, we will try and get the motorcades through as quickly as we can and as safely as we can."

Meanwhile, Tuesday's Anzac Day dawn service and parade are expected to draw tens of thousands of people to the CBD and are seen as a potential target for terrorism.

Last month, a western Sydney teenager pleaded guilty to planning an Anzac Day terror attack.

He was arrested on the eve of Anzac commemorations last year and his intended target was said to have been a remembrance service in Sydney.

Photo: Large crowds are expected at Anzac Day commemorations in Sydney next week. (AAP: Mick Tsikas)

While police said there were no known specific threats to this year's services, security would be tight.

Mr Murdoch said law enforcement and intelligence agencies were doing all they could to ensure the safety of the public.

"There is no intelligence to indicate there is a specific threat to Anzac Day ceremonies in Australia or overseas for that matter," he said.

Topics: anzac-day, event, terrorism, police, crime, law-crime-and-justice, sydney-2000

First posted April 21, 2017 08:48:17