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It's a loop, with one travel lane and one parking lane (which can be cleared in emergencies) in each direction. I don't see how anyone would ever be cut off.
Anacdote:
The town I live in has had two short sections of street completely car-impassible & blocked off within the past week. Not a problem due to the grid structure except for ~4 houses.
(One due to a water main break, and one due to a power line across the street.)
I think you are underestimating how often this happens due to the normally-relatively-contained consequences.
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Digging up the road to fix a water/gas/sewer main or something is the usual reason -- roads also need to be repaved from time to time.
Road work normally is not conducted in such a manner as to block the entire street. Rather, work will be conducted on half of the street, and traffic will be directed through the other half of the street (using alternating flow and flaggers if half of the street is too narrow for two lanes of traffic).
Not in places with sane street grids -- even in cases where you might theoretically be able to dig up one side (ie. not any sort of service main, which doesn't reliably stick to a particular part of the street) at a time it's way more efficient to put up a "Detour" sign and get the work done ASAP. Also safer, as you don't have traffic-worker interaction all the time.
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