Crossing the ferry at Walker Flat, South Australia: https://www.mapillary.com/map/im/s90byH5ctdgsvAFh8CngwA
Police pulling everyone over to check for drunk drivers and drug testing. This was only because people were going away for Easter long weekend. https://www.mapillary.com/map/im/RKjRB9sWzYNxdsUAXcr9nA
I was also stopped (a little bit later in the sequence), alcohol tested, drug tested, licence checked and vehicle plate checked.
Police really have nothing better to do in South Australia. If you turn off into a side street they usually have other police waiting or will chase you, nobody gets though unless is very busy with traffic.
Will have more once they are processed.