I was riding a class-four road in Vermont last Friday weekend, where said road goes from "maintained for the convenience of and at the expense of the developer trying to build a subdivision" to "not really maintained". Deer is hanging out a little to the right of the roadway, looks up at a coming, bolts left. I don't worry about it, continue slowing to line up my approach as we go into the trees and head up the rougher road, and the damned thing bolts back across in front of me, left-to-right. I was not expecting that. Then on Saturday, in northern New Hampshire, I saw a few. The second one materialized as a flash of brown movement while I was rolling along a logging road at medium pace; I got on the binders and stopped as it ran onto the roadway, followed shortly by a very cute, still-spotted fawn. The last one was standing in the logging road (somewhere between a one-lane roadway and doubletrack at that point), munching on the tall grass. I rolled up and stopped. It kept an eye on me and returned to eating. I pulled my camera out of my chest pocket and took a couple of photos. It kept an eye on me and kept eating. I decided to switch to video mode on the camera. It took a couple of steps down the road and returned to eating. About a minute (maybe 90 seconds) after stopping, I finally decided to keep rolling. I felt bad, as the deer decided to head up the roadway for maybe 1/8 of a mile before turning off. So, yeah, your guess about their behavior is probably as good as mine.