.... or do they.

Sometimes you see notes like: "The highway code applies in our Car Park." (the "StVO" in Germany).

But, do they? When you look at many SEC car parks you will see people parking all over the place with no regard to the official signs.

Customers often don't care as they expect that no one will give them a ticket. The Centre Management (CM) in turn will not want to alienate customers and bringing in the police or ticket wardens would just do that.

Some CM will attach (friendly) advisory notes to cars left in special needs parking spaces without displaying the required official permit to use these places.

Does it matter whether a car park is managed and regulated with some enforcement of the rules?

May be not to you. But what do your customers think? Would they prefer a organised car park? Would they support you in keeping special needs spaces free for those with the official permit?