I live in a seaside town in the south west of England. We have a long coast road, lined with houses and hotels on one side, mostly with no parking restrictions.
In the last few years campervans and motorhomes have set up camp, sometimes for a night or two but sometimes for weeks, on the road. So rather than pay for an actual campsite they sleep on the side of the road. It strikes me as (a) cheeky but mostly (b) unsanitary as many don't have self-contained facilities and there are problems with human waste littering the area 

It used to be for a handful of weeks in the summer but yesterday there were a dozen or so on the road and in the (free) car parks dotted along. AIBU to think that people should respect a residential area and not claim public space as their private holiday spot?