2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/96548We present high-precision Monte Carlo data for the phase diagram of a two-species driven diffusive system, reminiscent of traffic across a narrow bridge. Earlier studies reported two phases with broken symmetry; the existence of one of these has been the subject of some debate. We show that the disputed phase disappears for sufficiently large systems and/or sufficiently low bulk mobility.8 pages, 3 figures, JPA styleStatistical MechanicsPhysics and Societytext