The concentration of THC (Marijuana) in driver system while driving. The relationship between marijuana use and motor vehicle crashes has been both experimental and observational. Laboratory and simulator studies have found that a component of marijuana will decreased driving performance. Modest functional impairment experimental have shown with drivers has been that marijuana use alone has minimal effects on a driver’s performance. When marijuana is combined with other drug such as alcohol increased car crush risk. Combining with other drugs and used hours prior to driving the ability to control the vehicle becomes impaired. Waving of the vehicle could occur under the influence of marijuana but it was more intense fived when a combination
