Stuart, Putting "access:" in front of psv is a documented approach as set out in the Conditional Restrictions wiki page [1]. This is designed to create a hierarchy from simple restrictions (e.g. access:psv=yes, often shortened to psv=yes) to the more complex. Proceeding with "access:" follows the schematic of starting with the restriction-type which is required for all other restrictions.
However, due to legacy reasons, and as noted: > In access tags that are limited to a specific transportation mode the restriction-type *access:* is usually omitted. The above is for info only. I make no comment and a will take no action based on what you end up doing. It is clear however, that these tags are equivalent as set out on the wiki. Best regards, *Rob* [1] https://wiki.openstreetmap.org/wiki/Conditional_restrictions
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