Every state in Australia has a unique design which can be used to region-guess.
List: (Keep in mind that designs can vary slightly. These are only the common features)
Queensland:
Blue and white semicircle with bus icon bordered by curved frame (yellow or grey)
Western Australia:
Top half: green with white number, 3rd quarter: black with white oval and number inside, bottom quarter yellow with small text
South Australia:
Top: Yellow with number and bus icon, bottom: green and black. Pole is lower than the frame.
NSW (Timetable):
Top half: blue, bottom half: black and white with place names.
NSW (Bus Icon):
Curved hook border with blue rectangle rounded at the top with a large bus icon.
Victoria:
Combination of white, orange, grey and black strips horizontally.
Australian Capital Territory (ACT):
Blue on top and bottom. Yellow in the middle with bus icon and place names.
Tasmania:
Yellow on the top with a small strip of green on the bottom and green symbols and writing.
Note: This only applies to states.
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