In order to promote the public safety, health, welfare, convenience and enjoyment of public travel, to protect the public investment in public highways, to preserve and enhance the scenic beauty of lands bordering public highways, to attract tourists and promote the prosperity, economic well-being and general welfare of the state, and to provide a statutory basis for controlling junkyards consistent with the public policy declared by congress in title 23 of the United States code, it is declared to be in the public interest to regulate and restrict the establishment, operation and maintenance of junkyards in areas adjacent to interstate, primary and secondary highways within this state. All junkyards which do not conform to the requirements of this act are public nuisances.