[Tagging] man_made=pipeline - is onewayness implied?

[Rob Nickerson]

There's no "onewayness" for natural gas pipelines. They may have a
prevailing direction, but the direction of flow is not determined by the
pipe. It's determined by the pressure differential (gas will flow from high
to low pressure) and this can be changed via use of compressor stations.

A natural gas pipeline should not be tagged as oneway.

Rob
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