In the dry ? How were you driving ?
the one on the slip road it was wet, and it was one of those where you dont have to stop at the roundabout, theres a specific lane to let you continue onto the other motorway, in my vectra in any conditions safest speed would be at 40mph, i did 40mph in the lexus and lost the back which scared the living day lights of me, the back went right, and then left then right, whilst i was trying to correct it. after that i never did it at more then 30mph, even cars behind werent happy.
roundabout it was dry, was going my normal speed and then lost the back, but that was before i replaced my tyres, i think the thread was extremely low and illegal.
the difference in my eyes between FWD and RWD is massive and can be dangerous in a inexperianced hands like mine were