A later more extensive comparative traffic study of an 830-acre (3.4-km2) subdivision tested three types of layouts: conventional, TND, and Fused Grid. It also tested the resilience of all three layouts to an increased traffic load generated by increased residential densities. The study concluded that all types of layouts perform adequately in most low to moderate population density scenarios up to a certain threshold of 62 persons per hectare (ppha). As densities increased beyond the threshold so did travel time. At a 50% density increase to 90 ppha, the conventional hierarchical pattern showed the highest increase in travel time (20%), followed by the TND (13%) and the fused grid (5%). When the density increased further to include one local job per 2 residents, delays increased respectively by 139%, 90% and 71% for the conventional, traditional, and fused grid. This confirms the density influence on congestion levels and that a hierarchical pattern can improve flow if laid out following the access restrictions proposed in the ITE/CNU practice guide.