I've killed a mess of deer on roads just like you are talking about. You need a couple of things. One, go get you an old rearview mirror at the scrap yard. Mount it on a stick, and shove it in the ground, where you can watch behind you. two, get a comfy folding chair. three, buy a good set of shooting sticks, or cut a good shooting stick.

Sit your chair right in the middle of the road. Setup your mirror and shooting sticks. If a deer sees you, they will stop and look for a little while. This gives you a chance to raise your gun and shoot. Or if you are still they will just walk on accross after a few seconds of looking. I had a guy laughing at me at the club one year, because he saw my chair setup in the middle of a thick clear cut on a road. He went on to tell me how all the deer would see me, because I was sitting in a red chair in the middle of a road. There were 4 bucks killed out of that chair that year. You could see 3-400yds in both directions. It was a great spot.