Got caught on the motorway the other day with the top down. A shower started - I was surprised not to get too wet. The only problem being water travelling up over the top of the side windows. Rex.
I now live in the middle of a rainforest, so yes, I do get very very wet! The rain can be so heavy here that it's just like someone has emptied a big bucket of water directly on your head. Fortunately, it usually doesn't last very long. Good fun though
At M way speeds I think you might get away with it. But I've tried it on B roads and had to pull over and put the roof up.:-(( M.
Caught in the rain Got caught in the rain in Ireland last year a few times as you might expect. But only had to put the top up if it came on really heavy or we had to stop. As long as you keep 40+ you stay fairly dry. All good fun!