Many unclassified roads and B roads are "quiet". Sometimes the design, the carriageway, width, visibility and geometry encourages slow speeds, or there are low volumes of traffic or the observed (safe) speed is no more than 30 or 40mph. Many such roads would benefit from minor speed attenuation and signage - which would be more to widen awareness of walkers, cyclists and horse riders and attract a new special local designation.
See: https://ourlocality.org/localdevelopmentplan/oum-location/quiet-road-designations-on-the-majority-of-unclassified-roads/
Many East Lothian Roads are straight with sharp bends, encourage speed and hard breaking. Some of these would benefit froma designation that would serve to slow drivers if they see non motorised users or just encourage greater care.
Recreation & Access