Making Sense of the New Parking Rules

I canvassed several streets Sunday morning on my way to the Y to see if there was a rhyme or reason to the new reduced parking regulations. Thankfully, there does seem to be a logical system.  Based on my walking route, it seems that Lafayette and streets south will be cleaned on a Monday-Tuesday schedule, while north of Lafayette will be Thursday - Friday.  East of Cambridge gets cleaned earlier.

I haven't canvassed the northern neighborhood yet - any idea what the divisions are there?