In Beijing, policies to restrict motor vehicle use first introduced for the 2008 Olympic Games have been preserved with the current policy preventing the same motor vehicle from being used every day of the week. In 2012, Guangzhou followed suit implementing a mixed lottery and auction system. A further downside to these approaches is that they are likely less efficient than other measures which directly increase the cost of motor-vehicle use. Where governments wish to continue rationing licence plates, allocation through an auction would be preferable as it is more economically efficient than a lottery system.