Wow, How do they expect most people to know just what they want to say ?
Planarian ... soft body Tricladida ?
Planar ... point on a surface at which the curve is 0 ?
Planation ... reduction of land area to nearly a flat surface ?
Well the worm is out !
Why warn of no curve ?
Why warn of a flat surface ?
Just what the heck is it ?

- Bob

After some thought it must be the worm crossing after all

- Bob

I am a dull person a little slow too

The sign is for a worm crossing ! My thought was at first geology...

not biocenology !

- Bob

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