Regulatory areas of the Technological Risk Prevention Plan (PPRT) of the municipality of Vern sur Seiche - Ille et Vilaine (35)

For PPRTs, the environmental code defines a single category of zones for zones (L515-15 et seq.): risk areas. Unlike natural PPRs, PPRTs never include restricted zones that are not directly exposed to risk.Depending on the level of hazard, each PPRT zone is subject to an enforceable regulation. PPRT regulations generally distinguish between two types of zones:1- "no-building zones", known as "red zones", when the hazard level is high and the general rule is the prohibition to build;2- "prescribed zones", known as "blue zones", when the hazard level is medium and projects are subject to requirements adapted to the type of issue.The instructions in the PPRT development guide add a gradation within "red zones" and "blue zones".