Vivid Sydney crowds 'trapped' after drone show as attendees speak ...

Attendees at Vivid Sydney say they felt "trapped" trying to get home after larger-than-expected numbers attended the festival's drone show on Saturday night.

Vivid Sydney has drawn huge crowds to the CBD during the past two weeks.

Following last night's drone show, many attendees claimed they became "trapped" near the Overseas Passenger Terminal.

Police said a larger-than-expected number of attendees resulted in congestion, particularly in and around transport hubs.

Crowds dispersed after a short period and there were no injuries or incidents reported.

Vivid organisers are urging people to plan following the large crowds on Saturday.(Supplied)

Images posted to social media show the Circular Quay foreshore tightly packed with revellers.

Student Anthony Warren travelled from Melbourne to attend the drone show at Circular Quay.

He said he was worried "something bad" was going to happen as people tried to leave the area.

"There was a crowd of people without any explanation," he said.

"People didn't know where to go and started to crush."

Anthony Warren says he feared "something bad" was going to happen.(Supplied)

He said he could not see any crowd control people but he saw police officers disassemble metal barricades.

"People with babies, prams, elderly people — I noticed some were quite distressed. It was quite confronting to see." 

Former NSW government minister Victor Dominello attended the drone show and said crowd control was "non-existent from what I saw".

'It was human sardines," he said.

"These are New Year's Eve crowds but on steroids.

"No-one anticipated how many people would be on the foreshore."

Vivid Sydney organisers urged attendees to plan their visit.

"Vivid Sydney organisers work with government partners and agencies to plan and deliver a successful and safe event, including to manage the crowds that turned out to see last night's drone show," a spokesperson said.

"We understand that a large number of people leaving a major event at the same time can be slow and challenging and are grateful to the public for their patience and cooperation."

Some people who attended Saturday's drone show claimed they became "trapped" near the Overseas Passenger Terminal at Circular Quay.(Supplied: Ashmita Khadka)

Health Minister Ryan Park this morning said extra police would be on duty tonight for the second drone show.

'It's an incredibly popular event. It's a long weekend. It's good weather at the moment, people are out and about," he said.

"Police advise that there was a lot of people there, a lot more than expected."

Mr Park advised people not to go to the foreshore unless it was necessary.

"We're saying to people that if you can see the city, you'll be able to see the light show. 

"You don't have to be right down there at the foreshore."

A peak tourism and transport group has said locals were flocking to major central business districts across the country for leisure rather than just for work, especially in Sydney and Melbourne.

Margy Osmond from the Tourism and Transport Taskforce said people were flocking to the cities on week nights and weekends.