Paul Lyons downed a cocktail of drink and drugs before causing Mark Fleeman’s van to overturn across a motorway.
Lyons -- banned from the road at the time -- had chased Mr Fleeman, 32, after he had gesticulated to him about his manic driving.
A member of notorious Glasgow crime clan has admitted killing a dad in a road rage attack.
Paul Lyons downed a cocktail of drink and drugs before causing Mark Fleeman’s van to overturn across a motorway.
Lyons -- banned from the road at the time -- had chased Mr Fleeman, 32, after he had gesticulated to him about his manic driving.