The town of La Roche-sur-Yon, after having experienced an urban explosion during the 1950s and 1960s, symptomatic of the spreading of innovation from the upper urban levels, has seen, from the 1970s on, a demographic stability in contrast to the vigorous growth of the post-war years. The present period, not in the least unusual, corresponds to a new urban cycle, brought about by a process of innovation primarily restricted to large towns, and by a new form of urban growth, distinctly more centrifugal than the previous one, thereby shifting the urban front beyond the limits of the urban unit.La ville de La Roche- sur-Yon, après avoir connu une véritable explosion urbaine au cours des décennies 50-60, symptomatique d'une phase de diffusion de...