I have seen it go both ways. Ive driven to my stand and parked underneath it and have had deer come out and it not even bother them. Ive seen deer while on my atv and they just look at but the second I stop their gone. My largest buck to date came from me driving into the woods parking it and then hicking up the trail. I could see my 4 wheeler parked and the 8 pt came out rite next to it. One shot and he was down. Here's anothe example, I was still hunting last Thanksgiving and I had hiked in and set up a ground blind. It was a cold blue bird sky day, at about 8:30am another 8 pt walks out and I shot and missed (buck fever). Then the buck walks off and at that very moment a person on an atv drives by on a little trail that he had made to his stand. The buck turns around and well needless to say he's hanging on my wall. I think its a combo of it all. If its early AM b4 daylight I will drive in but I don't drive in the middle of the day, I'll walk in.