That would never happen in USA/Canada. We must continue to waste 5%+ parking capacity in the unlikely event that it could delay fire fighting and to continue using parking-space wasting valve orientation.
Search for Copenhagen here: http://freakonomics.com/2006/07/26/parking-spots-and-fire-hy...
I was trying to research which countries prohibit parking in-front of fire hydrants, because many don't, and don't burn down in 6 seconds.
I think the 90 degree turns with the hose are fine and can be fit between parked cars. It's the valve facing the street that can be a problem if it's obstructed, possibly needing to smash windows, because there isn't enough space to route around.
That way no one can block them unless they park on the sidewalk or in the middle of the street.
Why not make them usable?
Or just let people park in front of them, and bash the very occasional car window as a cost of doing business.