
The shocking footage was captured by Tony Seva on September 27 as he was driving on the busy A11 dual carriageway in Norfolk.
The footage clearly shows a blue Ford Focus behaving recklessly, cutting in from the left, narrowly missing a slow-moving tractor and then nearly colliding with the central reservation.
Mr Seva said he was driving at more than 50mph and the Ford Focus driver "came out of nowhere" at a much quicker speed.
The incident was reported to police but an incorrect time stamp on the footage meant that officers were unable to prosecute the driver. Norfolk police did however have "very strong word" with the driver in question.
Chief Inspector Chris Spinks emphasized that dashboard cameras were "vital" in investigating incidents on the road.
See the link below to view the footage
Dash cam catches swerving car narrowly miss tractor - BT