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?
That seems like a pretty stupid road design. Where I live one lane always has the dashed line go to the edge of the road to indicate which lane is ending and which lane is continuous, where the vehicle in the lane that's ending is the one to require indicators. There's never two lanes that just combine into one with no way to tell who has the right of way.
There is a way to know, it’s called a zipper merge as defined in a link I posted elsewhere in this post. They are done to reduce congestion and I suspect at times, post hoc on roads where there isn’t enough space for a proper lane end/merge.
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.