Traffic signals history

First traffic signals installed in London, UK

First three-coloured light signals in New York. Police operated.

First three-coloured light signals in England. Police operated.

First fixed time signals in USA using vehicle-actuated detector. Adopted soon after by England and Melbourne.

First traffic-actuated non-fixed time signals in Sydney, Australia.

1000 traffic signals installed in NSW

~2400 traffic signals installed in NSW ~1700 controlled by SCATS