The State Game Lands near Burgettstown PA are a prime example of this. I always know the first day of PA gun season because the sides of the road are packed withs cars and trucks.I often wonder what it looks like in there when the sun comes up. Last year there were seventeen vehicles parked together in one stretch. I'm not talking spread over a couple of miles, seventeen together. To answer your question, if it's just one vehicle and the area is bigenough for a couple of people then I'd go on in. I'd just make sure to keep my eyes peeled for the other person.
Being as I hunt 69 acres with two other people, I pretty much know where the others will be.