Story is here. Looks like the details aren't really known yet.
"November 22, 2008 11:54am
FORMULA One ace Mark Webber has been seriously injured when he was hit by a car while riding a mountain bike in Tasmania.
Webber, who drives for F1's Red Bull team, was cycling along Fortesque Bay Road, near Port Arthur on the Tasman peninsula, when he and a Nissan X-Trail vehicle collided, Tasmania Police Sergeant Jon Ford said.
Sgt Ford said Webber was competing in his own charity event, the Mark Webber Pure Tasmania Challenge, a 250km challenge using mountain bikes, kayaks and trekking, when the accident happened about 10.40am.
"As a result of the collision, the rider, Mark Webber, suffered serious but non-life threatening injuries," Sgt Ford said.
"He was attended at the scene by paramedics attached to the event before being airlifted to the Royal Hobart Hospital."
Sgt Ford said the event was being raced on open public roads and it was not known whether the stage along Fortesque Bay Road was cordoned off specifically for the racers.
The male driver of the Nissan X-trail escaped injury but no further details were known about the motorist, he said.
Webber was competing on the penultimate day of the five-day challenge, which also includes abseiling and whitewater rafting.
A rescue helicopter was flown to the oval at Port Arthur, just near the ruins of the historic convict site, waiting to fly to Oakwood to collect Webber.
Webber was then be flown to the Domain in Hobart and taken to hospital. "