This is an excuse often heard by Parkeringsgruppen.
Driving and parking a car in Denmark you are required to understand and observe traffic and parking signs just as you are local signage in any jurisdiction. If you do not understand the meaning of a parking sign we regret, but you should either seek guidance from people present or refrain from parking.
This may seem unkind, but too many signs or too much text on signs will confuse the majority of daily users thus causing them to be fined. Moreover, parking signs do not exactly add to the beauty of parking facilities which is another reason for limiting them.