A driver competes during the electric karting Super Cup of Romania in Bucharest, Romania. Aug. 18, 2018. The drivers age between 5 and 12 years. (Xinhua/Gabriel Petrescu)

Drivers competes during the electric karting Super Cup of Romania in Bucharest, Romania. Aug. 18, 2018. The drivers age between 5 and 12 years. (Xinhua/Gabriel Petrescu)

Drivers competes during the electric karting Super Cup of Romania in Bucharest, Romania. Aug. 18, 2018. The drivers age between 5 and 12 years. (Xinhua/Gabriel Petrescu)

A driver competes during the electric karting Super Cup of Romania in Bucharest, Romania. Aug. 18, 2018. The drivers age between 5 and 12 years. (Xinhua/Gabriel Petrescu)