RE: How do I know?
You should see some sort of trail and old rubs. I did just scout a news small section of woods but never saw any old rubs. I found the few trails they are running on but personally not enough traffic for me to waste too much time hunting. I might drop by a have a beer with the home owner one evening and shoot a few little deer just to help her out. My point after that long story is always keep looking for new spots. Keep scouting and you'll know when you find a highway.
Good luck this season.