Read them? As in plain text, or are you looking to do some processing of them so you want to access them? Also, can you upload a feature class with a couple of example streets?
I believe the answer is yes, or yes but....; however, I want to be clear what exactly you are after before I say yes or no.
I'd need to read and write them like you can with getVertices / setVertices. Basically like: vertex[xpos, ypos, zpos, curvehandleangle, curvehandledistance]
Haven't found anything in the doc about values beyond xyz, unfortunately. Sample data isn't really necessary, just make a two-dot line with the polygonal street tool.