Boundary Lane is, as the name suggests, a Boundary. This is the boundary line between Wales and England, with one side of the street in England and the other in Wales.
This cache is placed somewhere that can be accessed easily as a drive by or on foot.
Please keep an eye on young ones while looking for this cache as the road can get busy at times.
Please make sure you use stealth as the area is heavily populated and ensure you replace the cache exactly as found so as to keep it relativly hidden from muggles.