After a string of heavy goods lorry drivers drove their over-sized vehicles through low tunnels, causing huge traffic delays and damaging the tunnel structure, Australian authorities took extreme action. They had tried flashing signs, neon signs and staggered signs to no avail, so drivers are now greeted with a curtain of water falling from the tunnel entrance, with a huge stop sign projected on to it. The Softstop virtual barrier created by Laservision creates the illusion of a solid sign, forcing the driv