One of two cars driven by intoxicated teenagers wound up crashing on its side with its 16-year-old driver abandoning the trapped occupant following a botched getaway on Wednesday night.
Police were attending a disorder event at High St Mosgiel on Wednesday around 12.15am, when they spotted two cars coming towards them.
Senior Sergeant Anthony Bond said that when Police turned around to stop the vehicles, one of the vehicles took off at speed, while the other slowed down and blocked the motorway to prevent another patrol car from going past to catch the fleeing vehicle.
Police stopped the first vehicle at Kinmont, which was occupied by two 17-year-olds.
The apparent driver underwent a breath screening test and blew 671mcg, though investigations, which including reviewing of CCTV footage it was discovered the driver and passenger had swapped seats - he was also then screened for drink-driving, Bond said.