How Does a Traffic Circle Work?

THUNDER BAY – The City of Thunder Bay is holding public meetings to consult on traffic circles or roundabouts. While the concept is popular in Europe and some other North American cities in Thunder Bay the idea has generated, on social media, a lot of debate and discussion.
In this video with footage from the Alberta Motor Association the ways, a driver can use a traffic circle are shared.
Is a traffic circle or roundabout a good idea for the City of Thunder Bay?
The proposed roundabout is