Developers of the "champagne flute towers" on the old ABC site at Toowong plan to let traffic turn right across one of Brisbane's busiest roads where there is currently a "left turn only" sign.

The Grace on Coronation development will accommodate 635 vehicles, raising concerns of major traffic headaches on Benson Road, near Toowong Village, which carries 55,000 vehicles to and from the University of Queensland each day.

An artist impression of the Grace on Coronation project.

Archer Street at Toowong – right beside the former ABC site – is now a "turn-left only" onto Benson Road, which runs off Coronation Drive.

Developer Sunland plans three futuristic towers with 494 units at the riverside site, much of which will become a mix of public and private open space.