Gabalfa Flyover-Right of Way?

[Heathblue]

At the bottom as you head away from the city, just before the Wetherspoons. Who has right of way, vehicles who have entered via the roundabout who are in the left hand lane but want to get over into the right hand land which takes you to birchgrove, Llanishen or do those who are coming off the flyover and want to get left in order to drive up Manor way-North rd etc ?

My wife had an accident at this spot about 6/7years ago, had to go to court over it, knocked her confidence for 6, doesn't drive anymore.