Biking hazard: Tree sap?

I saw this note posted yesterday on the local cycling list.

Is there any thing that we can do with trees that leave such a big puddle of sap on bike lanes? I was riding today and I went through it and my bike skidded out from under me. I feel that it is a hazard.

I don’t think I’ve ever thought of tree sap has a hazard before. Has anybody else crashed or lost control after an encounter with tree sap?

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