In the background of this photo you can see the arches of the Provincial Legislature Building, which houses the Western Cape Provincial Parliament. The building is located in Wale Street, more or less opposite Mandela Rhodes Place.

If you see a sign like the one in the foreground, it means that you cannot stop your vehicle at the side of the road - even if it's just to pick someone up or drop someone off. This particular sign is a temporary one (they were doing some work at the side of the road and presumably didn't want anyone stopping while they were busy), but the markings on a permanently mounted No Stopping sign would be identical.