A motor vehicle inspection programme implemented by the California Bureau of Automotive Repair. The purpose of the I&M is to reduce emissions by assuring that cars are running properly. It is designed to identify vehicles in need of maintenance and to assure the effectiveness of their emission control systems on a biennial basis. Enacted in 1979 and strengthened in 1990. (Also known as the "Smog Check" program. ) For more information, please go to the States main smogcheck website.