In pictures: Red Bull Soapbox Race 2017

Red Bull Soapbox Race will take place at London's iconic Alexandra Palace once again in 2017
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(Getty Images for Red Bull)
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Team The Badaboom Beast take part in the The Red Bull Soapbox Race at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.
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(Getty Images for Red Bull)
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Team Gas Gas Gas races down the course during the Red Bull Soapbox Race at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.
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(Getty Images for Red Bull)
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A contender in The Red Bull Soapbox Race begins to descend down the course at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.
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(Getty Images for Red Bull)
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LONDON, ENGLAND - JULY 09: A contender in The Red Bull Soapbox Race begins to descend down the course at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.
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(Getty Images for Red Bull)
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Team Rockin' Rolla take part in the The Red Bull Soapbox Race at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.
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(Getty Images for Red Bull)
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Team Leek Lighting take part in the The Red Bull Soapbox Race at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.
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(Getty Images for Red Bull)
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Team Stein & Co. races down the course during the Red Bull Soapbox Race at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.
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(Getty Images for Red Bull)
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Team Hair Force One races down the course during the Red Bull Soapbox Race at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.
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(Getty Images for Red Bull)
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Team The Pie-On-Ears take part in the The Red Bull Soapbox Race at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.
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(Getty Images for Red Bull)
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Team The Rat Pack take part in the The Red Bull Soapbox Race at Alexandra Palace on July 9, 2017 in London, England. The event, in which amateur drivers race homemade unpowered vehicles down a track, was attended by 20,000 people.