I've tried this on many occasions. Once, a woman, with her children in the back of her car, still tried to overtake me. She ended up going round the wrong side of the traffic island, straight topwards a 'bus, with a look of utter panic on her face.
I'm pretty well convinced that the majority of motorists have no awareness of anything that's more than 1-2 yards directly in front of their bonnets. They see me (a cyclist) and hence I MUST be overtaken. They are not aware that 10 yards away there is a traffic island. Suddenly, they are confronted with the fact that in front of them is a) a cyclist and
a traffic island. Slowing down and pulling in is not an option .. so swerve violently to the right, round the wrong side of the island -- then notice the 'bus!!!!