we go very slow in campgrounds cause we do think of the roads as play area/walking areas for many. 
my kid was one drawing chalk in the road
my kid played on bikes in the roads
I drew chalk and bike with her :)
roads are sidewalks in cgs with people walking pets etc.
ALL rv'ers mostly know this and have seen it and experienced it.  the roads are used in cgs by pedestrians all the time.
kids dash and don't think therefore anyone truly ''speeding'' thru a cg is foolish but I must say in over 18 years of camping in many places, I have to say hubby and I must have said 'wow they are going way too fast' in a cg maybe 10 times at the most.  I have found most to be driving at slower speeds---maybe we are fortunate we happen to camp by good people at that time :)