It happened on the B3081 near Verwood - he had to be cut free by firefighters.
Double Silver Rounds Off The Sailing
Britain have finished the sailing events in Weymouth and Portland with two silver medals.
Weymouth's Luke Patience and Portland's Stuart Bithell had to settle for silver behind Australia and were full of praise for the new Olympic champions.
''We tried it, we got the better of them at the start and just managed to just sneak ahead,'' Bithell said.
''Unfortunately we sneaked ahead of the rest of the fleet as well. We had hoped they would be there as well.
''They sailed a fantastic race, we tried to attack them when we could and hats off to them. They held their nerve and are worthy champions. We're happy with second.''
Despite missing out on gold, Patience and Bithell were confident they would be back to the 2016 Olympics in Rio.
But there was no regret from the Britons after crossing the finish line at Weymouth behind Australia.
Patience said: ''It's not gold but there's plenty of time. We're young boys and we'll be coming back and we'll mean business next time round yet again.''
But Hannah Mills and Weymouth's Saskia Clark were upset to miss out on winning another British gold.
The duo, together for just 18 months, were beaten in the final by New Zealand.
Clark said: ''I'm gutted at the moment. We didn't even put a good show on really.''
An emotional Mills said: ''I'm pretty gutted to be honest. But we've had a wicked 18 months together and Sas is amazing, we've had a great time.''
Elsewhere there was more British success when Lutalo Muhammad, a controversial selection for the taekwondo team ahead of world number one, Dorset's Aaron Cook, won his first-round contest to advance to the quarter-finals.
Violent crime was up 37% in the last year. Police say it's mainly due to a change in how offences are recorded.
Anne-Marie Ellement took her own life after claiming she'd been raped by two colleagues.
48 Zany Zebras sculptures were sold off to raise money for Marwell Zoo.
Recently Played Tracks
On Radio: James Merritt
1am - 6am
Text 'HEART' to 82122
Deposit £10 to get a £40 Welcome Bonus - That's £50 to play bingo, slots and more!*
Over 50 tracks to make you feel-good. New album out now...
Find your local four day weather report here.
What's happening on the roads where you are?
Make Heart the soundtrack to your day and you could be a winner with great prizes up for grabs throughout the day.
Find out more about some of the companies advertising on Heart.
Get some great ideas on how to advertise your business on radio, online and on mobile.