Lindsay Lohan has blamed a mechanical failure for slamming her rented Porsche into the back of an 18-wheeler. After the driver of the truck, who has been identified only as James, came forward to claim that the accident was entirely her fault, the 25-year-old confessed to friends that she couldn’t have avoided the crash. “Lindsay is sticking with the “truck cut me off!!!” story, but with a twist, she claims she slammed on the brakes, but nothing,” TMZ quoted a source as saying. The truck driver said that he had been minding his own business when he felt the impact of Lindsay’s Porsche. “She came over and hit the back of the truck. Then the car pulled up on the sidewalk,” he said. And he even claimed that he could prove his innocence with the help of eyewitnesses who were at the scene. “They have a video of this whole incident,” he said. The truck driver alleged that he was driving at 40 miles per hour along the Pacific Coast Highway when the troubled actress hit him. Meanwhile, sources said that Lohan is insisting that the truck driver has made the whole story up in a possible attempt to extort money from her. Apparently she is also telling friends that she never offered him a bribe to keep quiet, as he had previously reported.