Someone in my road has had a large bag of sand standing in the road outside their house for weeks (possibly months, I can't remember when it first appeared). At first I assumed this was to save a space for the arrival of a skip, or for builders' vehicles etc, but the bag of sand is never moved, so vehicles delivering or collecting materials from the house have to park alongside the bag of sand, blocking the road. Meanwhile, nobody can park there. Is that a) allowed and b) reasonable?