[Talk-GB] Layby restricted to abnormal loads

[ael]

I have just tagged a layby provided for abnormal loads (on the approach
to a toll bridge) with

highway=rest_area
rest_area=abnormal_load
and, for good measure, hgv=permissive.

But I am not sure that conveys that only "abnormal loads" may park
there. And a data consumer that has no knowledge of my invented
rest_area value might direct other vehicles there.

I think these restricted parking lanes are fairly common.

I not very comfortable with using rest_area for laybys, anyway, but that
seems to be the current recommendation on the wiki.

Is there a better way?

ael