Around my area in Sydney a few new street signs have been popping up banning traffic from driving through at certain times of the day, without actually changing

Around my area in Sydney a few new street signs have been popping up banning traffic from driving through at certain times of the day, without actually changing the roads. The signs say for example 'No right turn 7am-10am' which is when morning traffic sneaks into the side street to get to the CBD faster. Then I got to sit on my balcony for 6 weeks watching the traffic cops ticket one car after the other until they stopped catching people.