Tour de France champion Chris Froome abandoned the elite road race at the cycling world championships with some 100 kilometres left as Britain were ruled out of contention early on Sunday.
Froome pulled out with six 16.6-km laps remaining after team mates Bradley Wiggins and Mark Cavendish also abandoned.
About half the peloton had pulled out by the halfway point of the 272.3-km, rain-hit race.
Former world champion Cadel Evans of Australia crashed out and was sent to hospital for checks, his team said.
The American team also suffered with Taylor Phinney, Chris Horner and Tejay van Garderen pulling out.