US officials requested that a roundabout outside the University of Queensland be demolished so President Barack Obama's G20 motorcade would not need to slow down, according to reports.
The Australian reported on Thursday that the Secret Service request was turned down by Queensland authorities.
A spokeswoman for Transport Minister Scott Emerson said she was not aware of any request being made to Transport and Main Roads, and the Queensland Police Service declined to comment.
Fairfax Media has approached Queensland Police Minister Jack Dempsey for comment.
Mr Obama is due to deliver a speech on Asia-Pacific leadership to a select audience at the St Lucia campus, part of which will be made into a G20 "declared area".
The president, who is expected to arrive after 10.45am, could make his way to UQ in a motorcade featuring the presidential state car, known as "The Beast".
On Wednesday afternoon, three helicopters were practised taking off and landing at Victoria Park Golf Club in Herston ahead of President Barack Obama's arrival for the summit.
The Police Commissioner has also declared an additional security area to manage a visit by Obama to the University of Queensland, St Lucia Campus.
Residents of the area and the public going about their general lives will find things no different than those residing in the CBD apartments or working, shopping or visiting the CBD and South Bank.
The additional declared area is proposed to begin at 8am on Friday, November 14 2014 and cease at 5pm on Saturday, November 15 2014.
While every attempt will be made to keep disruption to a minimum, people should expect that there will be traffic impacts between Brisbane City and St Lucia from 9am to 3pm on Saturday, November 15.
A copy of the map of the declared area is available at www.police.qld.gov.au/G20/maps.htm
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