Give them a layer tag that is lower than the layer tag of the highway. You
probably want layer=-1, where you add tunnel=culvert. No layer tag stands
for layer=0.

Polyglot

2012/11/29 Tom Taylor <[email protected]>

> I'm going crazy trying to add waterways. Naturally they won't validate
> where they pass under highways. If I add a culvert I can't seem to persuade
> the validator that the water is running through it.
>
> So how to do it?
>
> Tom Taylor
>
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