In the Velovision review of the Mezzo, I seem to recall Peter Eland saying that (whilst he didn't dare to), one of his colleagues had ridden the Mezzo no hands with some success, and put it down to the relative stiffness of the hingeless frame. Having said that, I haven't been over tempted to try it myself whilst navigating London rush hour traffic. Maybe one day on a quiet road, with soft verges all around to fall onto..