A speeding supercar driver suffered a dose of instant karma after slamming his brakes - and being shunted by the car behind. The owner of the McLaren 720S whizzed by motorists on a highway between Bangkok and Pattaya in Thailand. He was seen on camera ignoring speed restriction signs and undertaking over cars while allegedly racing his pal in a white Mercedes. But after suddenly approaching a set of road works the $300,000 sports car had to hit the brakes to avoid the waiting queue of traffic. Dashcam footage shows a black Chevrolet pick-up truck travelling behind at around 110kmph desperately swerve into another car to avoid the McLaren. The driver, Weerapong Thongchom, 29, failed to stop in time and collided with the back of the McLaren, which had to be towed after after the smash. The Chevvy then also clipped a Toyota to the left on the outside line.