Warning: The video above may upset some people. Watch with caution.

A drug-driver who was using his mobile phone while speeding down a road has been jailed for his part in a fatal collision on the A2.

At 5.10am on Tuesday, March 1, 2016 46-year-old Mark Sharp was driving coastbound on the A2 when his Nissan Micra was involved in a crash just before the M25 slip road.

He came to a stop in lane two, put his hazard lights on and called emergency services. He remained in his car.

Several other vehicles were then immediately in collision at the scene.

A short time later, aware of the lane closures ahead due to warning signs along the carriageway, vehicles were slowing down to move into lane one past the incident.

Stuart Lomas, 63, of Upper Wickham Lane in Welling, crashed into Mr Sharp’s car causing it to move into the third lane.

Two seconds later, 28-year-old Ahmed Mohamed of Ann Street in Woolwich crashed at speed into Mr Sharp’s car.

Mr Sharp died at the scene.

Tests on Mohamed’s blood showed he had 6.4 micrograms of cannabis per litre of blood. The legal limit is 2 micrograms.

Mohamed admitted causing death by careless driving whilst over the prescribed limit of drugs. He was also using his mobile phone at the time.

He was sentenced to four years 11 months imprisonment and a five-year driving ban to begin upon his release.

Lomas pleaded guilty at Maidstone Crown Court on Monday, June 26, to one count of careless driving.

He was sentenced on Tuesday, June 27, to six penalty points, fined £375 and ordered to pay £250 court costs.

Senior investigating officer, Sergeant Chris Wade of the serious collision investigation unit, said that had the drivers followed the highway code that this death could have been avoided.

He said: “Both of these drivers had been driving in the second lane, and if they had been travelling in lane one - as per Highway Code guidance - like many cars before them, they could have both passed the crashed cars without incident.

“Regardless of whether you drive the same stretch of road daily or not, drivers need to remain alert that these incidents can occur at anytime, anywhere, and to anyone, and complacency and lack of concentration can - and does - lead to tragic consequences.

“My thoughts are with Mr Sharp’s family who have shown the utmost dignity and understanding in what has been a very prolonged and distressing case for them, and I thank them for their support throughout.”