It happened on the A1 near Dunbar.
Man In Court Over Murder Of Scots Policeman
The man accused of strangling and dismembering a police officer he met on gay dating website Grindr will enter a plea later.
Italian Stefano Brizzi, 50, allegedly murdered 59-year-old Pc Gordon Semple at his London flat some time between April 1 and April 7.
Mr Semple was originally from Inverness in Scotland and had been with the Metropolitan Police for 30 years.
He went missing on April 1 and his remains were discovered a week later after a neighbour alerted Scotland Yard to a "smell of death'' coming from a property on the Peabody Estate in Southwark Street, south London.
Recorder of London, Nicholas Hilliard QC, has already set a provisional date for Brizzi to face trial on October 18.
The defendant, who is in custody, is due to appear before the Old Bailey judge via video link.
The 26 year old was first targeted in Briarscroft Road.
Euan Johnston was shot in his car last month.
The family of three crash victims took their case for the 59-year-old to be put on trial to the Appeal Court in Edinburgh earlier this year.
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