I think Chris’ point is along the lines of the Cry Wolf story. If they make arbitrary closures then people become immune and ignore the signs in cases where they are closed on safety grounds.
@ChrisBeach I do however disagree that the road closures in the link from the other thread are arbitrary. There are URLs posted there to closures being council policy to calm streets and make them safer for pedestrians and cyclists - perhaps you mean the selected roads appear to be arbitrary because the council hasn’t made their reasons public. Silverdale for example is a notorious ‘cut through’ as defined in the council’s strategy (albeit they called it something else) - seems evident that was not an arbitrary decision.