I was told more than once that I needed a flag on my recumbent bike so that I wouldn't get run over by a semi. In fact, when I pedaled across streets, I sat so low to the ground that there was even an element of danger that a mini cooper driver would not see me.
Originally I was responsible enough to have a bike flag installed, but but when my teenager rode my bike, he thought it looked dorky so he took it off. Then I didn't want to be road kill so I put it on to ride, then he took it off and rode it, then I put it on, and he took it off, and after a few hundred times, it broke.
But never fear, I have not been flattened! I found a solution.
There is always a way.