INNER-CITY residents will have to carry passes to enter their homes when the city goes into lockdown for the world's most powerful leaders at the G20 summit.

The Courier-Mail has been granted an exclusive briefing with the team of police and other authorities already planning the unprecedented security crackdown for the event in November 2014.

Up to 5000 officers will patrol the CBD and South Bank during the event - including up to 1500 specialists from Queensland, interstate and overseas as well as army and security personnel.

Rolling lockdowns will close roads from the airport to the central business district, while streets will be shut and people living near the event precinct will require ID and security clearance.

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POLICE bosses say they are ready to face terrorist threats and protest groups as they prepare for Brisbane's G20 summit.

Brisbane will be on unprecedented high alert, but police want it to be "business as usual" for the $370 million event.

Ferries on the Brisbane River and trains and buses on routes that travel into the security zone around the event venue - the Brisbane Convention and Exhibition Centre - will be affected and at times may not run at all.

Parking will be limited in some city areas, and rolling lockdowns will shut streets as dignitaries, including US President Barack Obama, travel in motorcades.

People living around the G20 security zone will need accreditation and IDs when the event is held, on November 15-16 next year.

Specialist teams including the Special Emergency Response Team, the Dignitary Protection Team and Public Safety Response Team will have their numbers boosted as part of a daily contingent of up to 5000 officers.

Queensland police's G20 executive officer in Brisbane, Assistant Commissioner Katarina Carroll, said she was aiming for minimum effects on businesses and residents, but contingency plans were in place if there was a terrorist threat.

"Certainly if we're at a medium threat our response is going to be very, very different to what a high threat level will be," she said.

"But as we plan it's definitely the case that we want to blend in with what's happening in the city and the community."

Ms Carroll said intelligence was also being gathered in relation to protesters.

Deputy Commissioner Ross Barnett, overseeing specialist operations, said Brisbane residents should expect security to be at a similar level to the Olympics, but he would not detail the roles of particular units and their capabilities.

At the London Olympics, defence included the army, sniper teams, a helicopter carrier on the Thames and surface-to-air missile systems in six locations.

He said police would be as "low-key" as possible, but there would be disruptions, and Brisbane City Council and Queensland Transport were among agencies working with police.

The South Bank-based Queensland Conservatorium of Music, QPAC, GOMA and ABC have been contacted about possible effects.

"I'm sure everybody will be understanding that is a small price to pay for the opportunity that we've been given to host this world-class event," Mr Barnett said.

Ms Carroll will have a planning team of 110 officers and staff.

She expected security for the US, Russian, Indian and Chinese heads of state to protect their leaders in "similar fashion", and said delegation sizes would range from 60 people to several hundred.

G20 Taskforce assistant secretary of security Peter Docwra said the Government would not budge on its "no weapons" policy, which would ban foreign security teams, including the US Secret Service, from holding guns.

"I can't see any change to that policy being applied for this event,"he said.

People living within the security zone of the event would undergo checks to ensure there were no threats, but Mr Docwra said it was just a matter of "making sure that the people who are actually there are the people who should be there."

Police Minister Jack Dempsey said: "The challenge will be to have the city in the highest level of security providing protection for world leaders while at the same time minimising the impact on the community."

"We are looking forward to embracing the challenge and showcasing the Queensland Police Service as a world leader in public safety and security."