Shocking footage shows the moment a drink-driver crashed his van after swerving across a busy motorway - before he was found fast asleep behind the wheel.

Jamie Barrett, 30, was spotted driving dangerously as he headed north along the M1 in Nottinghamshire on September 14 this year.

A concerned witness contacted police to describe his erratic driving as if he was "shaking his steering wheel quickly from left to right."

Dash-cam footage captured Barrett veering all the way from lanes one to four as he recklessly drove in his black Ford fan between junctions 25 and 26.

Barrett narrowly missed other vehicles and can be seen at one point colliding with the barriers before he came to a stop when he ran out of fuel.

Police body-cam shows how officers then discovered Barrett slumped behind the wheel fast asleep.

He was awoken by officers who said he began to speak incoherently and his speech was slurred.

Further damage found to the van suggested he had also crashed into the motorway barriers earlier on in the journey.