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I've seen these bikes parked anywhere from a day to months at a time without a ticket.
So, from Kenmore to Packard's corner, on the whole I've concluded that:
-sidewalk parking is illegal, but depending on circumstances (ie. after the 1st concrete slab on the sidewalk is NO longer boston property at BU), you might be able to get away with short-term parking
-parking at the end of the street (or right next to crosswalks) where there's just enough space for bike parking is illegal (for not parking in a metered space), but, depending on the meter maid, most of the time you can get away with it
-parking halfway between two parking meters is illegal, but it's also dependent on the meter maid
-parking in the space next to a fire hydrant is dangerous (if there's a fire), and illegal, but I've seen people get away with it on short-term parking
-if you're going to try any of this, your best bet is end-of-the-street parking, on backstreets
-bike racks are "legal" according to some university parking systems
I used use bike racks for an entire summer, then tried end-of-the-street parking for 3 weeks and never got a ticket.
But in any case, all these examples REALLY make me miss owning a motorcycle