Sign of the times

摘要

This safety warning system was actually installed in the Sydney Harbour Tunnel in Australia as far back as 2007. Called Softstop it projects light on to water in the form of mist to create stop signs that appear to float in the air. Developed by entertainment communications company Laservision and deployed at an instant's notice, the barrier system produces a pseudo-holographic 'stop' message that is impossible for drivers to miss. One of its advantages is that while conventional warning signs appear in the peripheral vision of drivers, this appears in the direct view of motorists. The illusion of solidity is an added trigger for drivers to stop.