Excellent Idea.
So, every time you take your bike into a building with an 8 foot ceiling, one has to take the flag off.
15 feet? That is above the view of most cars. Perhaps visible for truck drivers?
I wonder how many bike paths in Missouri have less than 15 foot clearance? Is the plan to make sure every underpass and tunnel and culvert the trails go through have the minimum of 15 foot clearance?
Trees trimmed to less than 15 foot?
What about the mountain bikers? I could imagine heading down a MTB trail with a 15 foot flag flying above one's bike.