An alternative, rotary traffic signal designed by Charles Marshall in 1936 & used from the 1940s through 1970s in Australia. 2 rotors pointing at colored sections denote whether traffic in either direction should proceed, prepare, or stop. Based on a traditional clock face, it has the advantage of clearly showing signal phase timing.

It’s downfall was apparently the ability to cope with changing traffic loads. Wikipedia Entry

posted by Aaron Barker on Thursday, May 29, 2008
tagged with design,, traffic