A dopey driver has been caught on video using his mobile phone at the wheel - while speeding up the foggy M5 this afternoon.The rush-hour dimwit was filmed by a fellow motorist's passenger as he drove at high speeds on the M5 near Exeter.The man who filmed the footage at 4pm today told The Herald's sister title, The Exeter Express & Echo, that he was "gobsmacked."The footage was recorded near Splatford Split - a busy stretch of the motorway.READ NEXT: Mum in terrifying ice crash...
