Why dont hardstandings go all way to the road.?

Just come back from Cherry Hinton site last weekend and has you might imagine it was a bit wet. Lovely site but the hardstanding on as lot of the pitches dont go all the way to the road. so as you might imagine the front of the van to the raod was a large puddle. I know it is reinforced grass so didnt turn into a sea of mud. But paddleing to get into front locker and hitching up etc. The pitches are rather narrow as well , we didnt use awning this time but if we had then the only place for the car would have been on the grass or across the front which ould have obstructed the road slightly.