The Portland moving truck curb permit

On Portland's older, tighter streets a moving truck can't always just park. The city's answer is the Temporary Street Use permit, which reserves on-street space for a moving truck or a storage container for a set window.
What it does
The permit posts reserved space at your curb so the truck has somewhere legal and close to work from. That matters more than convenience: every extra yard between truck and door is billable worker-hours, and a truck circling a dense block is time you're paying for either way.
The narrow-street catch
On streets under 28 feet wide the reserved space works differently: a standard barricade posting isn't valid there, and some blocks can't take a reservation at all without reserving space across the street instead. The reservation also only becomes enforceable if the posting and verification steps are done right, which is the part people skip and then can't understand why a parked car stayed.
Whose job it is
Ask on the callback. Movers who work the inner eastside and the older streetcar grids deal with the permit routinely and will say whether your block needs it, who files it, and what it adds to the job. What they need from you is the honest version of your street: width, parking pressure, alley access if any.
The cheaper version of the same idea
Where a permit doesn't apply or isn't needed, cones and a note to the neighbors sometimes hold space informally. Nothing enforces it, though, so on a tight block the permit is the version that holds.