This idiot van driver braked in the left lane of the motorway then exited without indicating his intentions. I was in the right hand lane for A358 east and he then crossed into my lane again without indicating. The craziest thing though was the fact that he needed several lanes to negotiate the roundabout. I watched him pass through 2 if not 3 lanes to end up going the same way as me. I don't know what he was focussed on but it certainly wasn't his driving!