Dr B organises Audax rides as well as participating in them. A while back, he needed a readily visible checkpoint sign. I made one for him out of a sturdy carton, and using velcro to hold the shape and some reflective strips to add visibility in poor lighting (early morning, early evening, night-time and overcast weather). This first time, we weighted it with a rock so it wouldn’t blow away.
At a later ride, where the weather was less clement, I covered the whole lot with clear contact – I have to say, that was a messy sort of business – and sewed up a sack of marbles and/or decorative pebbles to hold it down. After the ride, the sign and the sack were never seen or heard of again. (It’s a sad fact that there are plenty of spiteful folk about who would probably think it a joke to do away with such a sign.)