[Tagging] What's the difference in these tags?

[Dave F.]

Hi

A user has changed some tags of a way:

1. oneway=yes to access:backward=no

2. psv=opposite_lane to psv:backward=yes

What are the differences between the tags? The originals are the more 
commonly used. I'm unsure how it adds any detail or clarity to the 
database. You thoughts please.

Dave F.

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