A Barnes Dance (aka Scramble Crossing) lets pedestrians cross in all directions.
This treatment can reduce pedestrian crashes by up to 51%, but may actually increase crashes for other vehicles (Chen et al, 2012).
In terms of efficiency, they can increase both the pedestrian and vehicle wait times in some situations (Nash and Smith, 2010), or a lessening of each of the phase times may be required.
A case by case assessment is required.
More info: Australian Standards AS 1742.14 (2014) and VicRoads Supplement to AS 1742.14 (2015)
Photos: Safe System Solutions Pty Ltd, stuff.co.nz, adapted from Wanjing et al.