I was just looking at the location via Streetview and satellite image as you were posting Steve. Part of my job is to investigate claims (which often involves safety fences) and I know that that situation wouldn't be permitted on our roads for 70mph, let alone the speed these guys go at. Safety fences and the installation of them have come on leaps and bounds in the last few years. If that was on our roads, the closeness of the trees may be an issue, but the spacing of the safety posts would be an issue; but whether the posts are driven, concreted-in or placed in concreted-in sockets if determined by ground conditions
Either way, the poor lad is no longer with us