31-28-10.1 Standards for supplemental guide signs--Rules--Definition. 31-28-10.2 Safety as prime consideration in supplemental guide signs--Traffic generating capacity secondary. 31-28-10.3 Supplemental guide signs for smaller institutions. 31-28-11 Markings to conform to uniform national signing standards on streets and roads constructed with federal aid. 31-28-12 Markings on highways under commissioners' jurisdiction--Distances between third class municipalities--Cost of markings. 31-28-13 Markings by local authorities--Local regulations not enforceable in absence of sign--Location and legibility of sign. 31-28-14 Unauthorized signs, markers, and signals prohibited--Authorization to organization. 31-28-15