For the purpose of promoting the public safety, health, welfare, convenience and enjoyment of public travel, to protect the public investment in public highways, and to preserve and enhance the scenic beauty of lands bordering public highways, it is declared to be in the public interest to regulate and restrict the establishment, operation, and maintenance of junkyards or scrap processing facilities in areas adjacent to the Federal-Aid Interstate and Federal-Aid Primary Systems of Highways within this State. Junkyards or scrap processing facilities which do not conform to the requirements of this Act are declared to be public nuisances.