Hi,
OSM is driven by volunteers mapping what interests them. If you know where a layby is, then by all means add it:
https://wiki.openstreetmap.org/wiki/Tag:parking%3Dlayby

Personally, as a regular driver and cyclist past this layby, I'd prefer something more rural (e.g. QEII Park) although it is often used by HGV drivers.
Survey image:
https://www.mapillary.com/app/?pKey=1179378515964201
Happy Mapping,

James