IIRC if it’s a ‘built up area’, which means it has street lights, then in the absence of any speed limit signs, and no repeater speed signs (aka the little ones which IIRC have to be less than 200 yards apart), then the applicable NSL is 30mph.
Whilst true, the dualled A78 running parallel has street lighting as does the old road that used to connect to the roundabout at the papermill that is now just an access road (the one that runs behind the paper mill and is cut off by the railhead). I think at some point someone at Cunninghame District Council had money to spaff and wanted the bit joining Kyle and Carrick to look pretty.
Don’t get me started about the lights 🙄
My favourites are the random ones on the Loans road just along from the turnoff to the res 😆
Kids these days don’t know how good they have it, we had to do the long (and fast) way round or shlep through the fields if it wasn’t too muddy (which it usually was outside the height of summer).