Regarding part 1:
* I would mark the road type as a ramp from the end of the I- 5 until after the bridge where I- 405 starts. (the segment you have hi-lighted in the Papyrus link as well as the next segment to the north)
* Label as exit per the sign
* Hopefully the little hook in the road at the beginning of your hi-lighted segment will force a keep left voice instruction
* I would mark the road type as a ramp from the end of the I- 5 until after the bridge where I- 405 starts. (the segment you have hi-lighted in the Papyrus link as well as the next segment to the north)
* Label as exit per the sign
* Hopefully the little hook in the road at the beginning of your hi-lighted segment will force a keep left voice instruction
Re: Dealing with the start of I-405 N in P-town