TMR put this up on their Facebook asking who has to give way, but that's too easy. A much more complicated question is: what does the law say around indicating?
I've seen people say only blue must indicate, others say both must indicate, and yet others say neither must indicate. Which is correct?
Yeah you don't usually see it like in this image. It tends to be that where two lanes merge, it's more like a road narrowing equally between both lanes, rather than one lane appearing to end while the other appears to continue. The Gailey Rd screenshots I've posted elsewhere in this thread are an example.