All areas of the subdivision or features adjacent to the subdivision, which present a potential threat to the public safety, shall be fenced with a six foot (6') nonclimbable fence or masonry wall as required by the planning commission. Such hazardous areas may include, but are not limited to, rivers and streams, canals, cliffs, ravines, arterial or collector streets, railroad rights of way, and steep slopes. The fence or wall shall be constructed and included as part of the subdivision improvements and shall be bonded. (Ord. 94-40 § 1: prior code § 30-35)