A drug trafficker clocked up 130mph trying to outrun police on the busy A9.
Lawrence Mitchell, 26, continued to drive after spikes laid across the road blew out the front tyres of his Audi.
He was caught after the tyres came off the wheels and the Audi, out of control, mounted a verge on the A9 near Aviemore, and came to a halt.
Advocate depute Peter McCormack told the High Court in Edinburgh on Tuesday that police had been watching Mitchell and another man, Louis Butler, 25, after a tip off about drug running between Liverpool and the North East of Scotland.
The operation resulted in the seizure of heroin with a possible street price of £64,570, judge Lord Bracadale was told.
He will sentence the two next month in Glasgow.
Mr McCormack said Butler of Aberdeen had rented a static van at a caravan park in Keith Road, Fochabers.
A BMW linked to the two men was seen there and later that same day the Audi arrived.
On March 22 officers were told the Audi was heading south to pick up drugs.
They kept watch near Perth and closed part of the A9 to traffic to stop Mitchell's car.
Mr McCormack said as the Audi was signaled to halt the car accelerated away avoiding the police vehicles in front of it.
He said: "Mitchell repeatedly drove on both sides of the carriageway in an attempt to pass the police cars and was driving at speeds of between 100mph and 130mph.
"Eventually a 'stinger' spike strip was deployed resulting in the two front tyres of the Audi being deflated.
"A rucksack in the Audi was found to contain more than half a kilo of heroin. More of the drug was found in the caravan and in Butler's pocket."
Mr McCormack added that thousands of pounds had been deposited at a bank in Buckie and sums of money then transferred to accounts of people with Liverpool addresses.
Both men pleaded guilty to being concerned in the supply of heroin in February and March this year and Mitchell of Silverbrook Road, Liverpool, also admitted dangerous driving.
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