I think you would be very lucky to be in such circumstances that a road would present itself as an ideal forced landing runway!!. .Bridges, Lampposts, signposts, telegraph poles with wire you cannot see etc.... Just think. Its a disaster waiting to happen. . .True, you can get some of these in a field but at least there you dont have to worry about other traffic. You do have a responsibility as a pilot not to put others on the ground at risk too.. .. .I have also pondered this too, long and hard, subsequently deciding that it wasn't a good option and better to dismiss it totally than to forever consider it as a possibility.. .For the record, Gary Newman (New Wave Pop Star?)has done this but it was years ago and I was just a kid!! . .Maybe he can help?. .Stil, dont do it is my judgement.