Synchronised fell first time round this year but continued riderless for another five fences before fracturing his leg.
BBC: Grand National: RSPCA urges scrap Becher's Brook
Most experts agree that an open oval such as the mile-long track at Churchill Downs would present problems for riderless horses.
WSJ: Kentucky Derby: Do Horse Races Really Need Jockeys?
Video of the annual riderless race in Ronciglione shows that horses there do make turns, although the surface is slippery and they don't seem to be running at full speed.
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