Getting It Right In A Roundabout Way.
Using an indicator seems to be the ONE major issue that the overwhelming majority of Australian drivers have. Pulling away from a curb, merging lanes, entering and exiting roundabouts, the little bit of flash seems to elude drivers on Aussie roads.
From the NSW Roads and Maritime Services website are the following regulations for indicating at a traditional four point roundabout.
Turning left: On your approach to a roundabout you must select the left lane, signal left, stay in the left lane to exit.
Going straight ahead: Do not signal when approaching the roundabout but always signal left before exiting a roundabout.
You may approach the roundabout from either left or right lanes (unless there are road markings with other instructions), drive in the same lane through the roundabout and exit in the same lane.
Turning right: On your approach, to a roundabout you must select the right lane, signal right, stay in the right lane and signal left before exiting into the right lane.
Making a U-turn: When you use the roundabout to make a U-turn on your approach signal right from the right lane, stay in the right lane, but signal left before exiting into the right lane.
Exiting a roundabout: If practical, you must always signal left when exiting a roundabout.
In many areas of Australia a three point roundabout can be found. It’s here that one part of the where to indicate equation isn’t really pushed as a safety measure. Once listed as a “complex roundabout” the regulations are to indicate in which direction you wish to go to then indicate left to exit, especially if making a major direction change as per the design. Here, though, the overwhelming majority of drivers coming into the roundabout from the right hand side and wish to continue to the left, do NOT, as per the regulations signal their intentions. Quite a few do not indicate from the lower left to the top left, nor from the lower left to the right hand side.
From the W.A Government’s site when it comes to merging: Always use your indicator to signal your intentions to other drivers when merging; Keep a safe distance between your vehicle and the vehicle in front of you and take turns to merge if there are long lines of merging traffic; You need to match the legal speed of the road you’re merging into. Again this part of the road safety argument is forgotten. 
Finally, when parents that have themselves not had a driving lesson in ten twenty, thirty or more years and have accumulated a lifetime of bad driving habits are in a car with a L plater, and fail to have them adhere to the same basic laws, then our roads will continue to not see the zero level our governments purport to seek.
Level 2, 9 Help Street