To add to the list:
Anywhere might your vehicle (OR your vehicle in combination with others) might cause an obstruction.
For example, if the road is fairly narrow and there are already vehicles parked on the other side of the road, you shouldn't pull up directly opposite them or very close to such a position.
"On the approach to a bend" is another position where you shouldn't pull up (and where you would be deemed to be causing an obstruction), as drivers who have to pass your car are forced into the path of oncoming traffic, which they won't be able to see.
"Anywhere which restricts the visibility of pedestrians seeking to cross the road" should also be on the list.