It's closed at Riverside and just the otherside of the bridge. It's entirely passable by bike, not be car.

It closed last year some time.

That route is my bailout option if the wind is too high and I don't fancy eating 23mph of headwind going home. I head through there, round the back of Manana to Walnut Hill and get the train home. My office is just past the end of the Campion trail.