I mastered the 'arc' in Chattanooga. I think someone posted a How to pee like a Pro video on FB. Roll short leg up, end out, boom, I was pee free and dry as a proverbial bone. I would not have got away with "it was water". The chick behind me was actually impressed, possibly because she wasn't sprayed with piss kicked up from my tire but possibly because she saw how pleased I was with myself and didn't want to ruin my enjoyment.
As a side note, if you go 'to the left' in the US then you risk actually hitting the marshall so ....something to be careful of.
If you race in the states, it is a lot easier if you "dress to the right" so you can go off the side of the road. If you are naturally a "leftie" it can be tough especially in bibs.