Murphy-Seaman reached speeds of up to 95mph along the 70mph section of the carriageway and was driving at between 80mph and 85mph in the 50mph zone.
The court heard the defendant continued until he reached the Shell petrol station next to McDonald's near to the Brundall roundabout.
Mr Renvoize said Murphy-Seaman "decamped" and went into McDonald's where he “locked himself in one of the cubicles”.
But the defendant later gave himself up following the incident which happened at about 3.45pm on February 7 last year.
Murphy-Seaman, of Buckingham Road, Norwich, appeared in court on Wednesday (May 19) having previously admitted dangerous driving.