Motorsport road racing circuits and events were banned in Switzerland following the 1955 Le Mans disaster with the exception of events held in a time trial format such as hillclimbing. On June 6, 2007 an amendment to lift the ban was passed by the lower house of the Swiss parliament. However the proposed law failed to pass the upper house, and was withdrawn in 2009 after being rejected twice. In 2015 the Swiss government allowed a relaxation of the law, permitting head-to-head racing for electric vehicles only. In June 2018 Switzerland hosted its first motor race in 63 years when the first Zürich ePrix was held as a round of the all-electric Formula E championship.