Cycling is a popular activity on the Big Island. The road from Kailua Kona to Hawi is wide with good shoulders, and it’s a favorite with cyclists because it’s the route of the cycling portion of the Ironman race. However, as is the case everywhere, it can be a dangerous activity, sharing the highway with large, fast-moving vehicles.
Ghost bikes serve as memorials for cyclists killed or badly hurt when things go wrong. These are two I see daily on my commute.
Graham's Island 
There are a few here as well but no one rides on the busy roads. maybe there could be some on the back roads. A great idea to bring attention to the drivers to be aware of cyclists
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That’s the idea, a little reminder to both motorists and cyclists of the dangers on the road.
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Are these permanent or ad hoc memorials? Ive seen ad hoc tributes of flowers on hiways but never ghost bikes.. its a fitting tribute.
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They’re basically permanent. Some might get taken or removed, but mostly local cyclists keep them up in decent condition. It’s a relatively recent idea from the U.S. mainland in the early 2000s I believe.
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