This all being said, I hope too that most officers would not worry about a brief standing up to stretch the legs. Heck I doubt that many of them even know about the law. Most if interested would just stop you for careless. Cool your jets, not saying it is, just saying that would most likely be the ORS they would "reach" for fist in stopping a rider standing. And remember, if you do get pinched for it, depending on your state's laws, trying to argue that you have been through what ever class for off road or what not is not going to fly for on road, normal riding.