[Tagging] emergency bays - which side?

[Volker Schmidt]

The tag highway=emergency_bay as node is in use 3700 times, even though it
is still only a proposal.

How do I indicate the side of the road the EB is serving in the case of a
bidirectional road.
I could see two valid approaches:
direction=forward|backward
emergency_bay=right|left
It seems that none of these has been used so far, most likely because the
mapping so far has only regarded one-way roads.

Volker
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