I'm pretty sure that at leat one road will have to be raised over a partially sunken LRT line, or closed completely. Considering that the line will cross 4th, 5th, 6th, and 7th, and there is no chance that 7th will be raised over, it would have to be 4th, 5th, or 6th. My best guess would be that the trains will come down from the bridge over the river, and just continue down into a tunnel right away, and 4th ave will be raised as needed.
The other feasible option that I see, is maintain the existing 4th ave crossing, then raise the line up slightly, before starting to head down so that it's going down slightly as it crosses 5th at the current grade, but revised, then slope down under 6th,which would have to be raised, before getting under 7th as it is right now.
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