I believe the only car sensor for SCATS is an inductive loop so it doesn't know the amount of backed up traffic, and it was developed in the 1970s and rolled ou

I believe the only car sensor for SCATS is an inductive loop so it doesn't know the amount of backed up traffic, and it was developed in the 1970s and rolled out across Australia in the 80s - it's better than a timer but I don't think it should be what the world aspires to. That being said, I had some interesting conversations with a person who worked for Transport for NSW who said some of the signalling backend was recently improved to streamline future integration with self driving cars, I can't find a reference for this though.