This is easy to do and not that risky really. Given certain winds and high tides, waves can break over the Churchill Barriers. If things get too bad, Orkney Island Council closes the road. But up until then, put your windscreen wipers on full and maybe get yourself a salty car-wash...
This is what it's like when you can't cross. That's several tons of water looking to squash one's car flat. There can even be rocks in it. This picture was taken last Thursday afternoon and it was a wait of a few hours for the tide to go down before anyone could cross. This sort of fun doesn't happen very often, however.
The storms of the last few days have died down completely today and the weather is beautiful again. I took these pics a hour or so ago (Monday 11 Jan, ~2pm)
I like to take photos and am fond of clichés - so I'll say I find them to be worth a thousand words.