It hasn't totally solved the problem yet, because some people are still doing U-turns - we even saw a large articulated vehicle do it the other day. Even worse, some of the drivers are going through the wrong gap in the central reservation and meeting legitimate turning traffic head-on, or turning through the three-way Sundridge Park / Rodford Way / Shire Way junction. There have been a number of injuries, both motorists and cyclists.
It is proposed to put legally enforceable "No U-turn" signs for eastbound traffic at the central reservation gaps near Abbotswood, Glenfall, Bredon, Sundridge Park, Dovecote and also at the eastern end of central reservation near the Scott Way roundabout.
You can see the plans and the explanation on the South Glos website. The consultation is open until 12 February,