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 other roads maintained by the state, and to preserve and enhance the scenic beauty of land bordering public highways and other roads maintained by the state, it is declared to be in the public interest to regulate and restrict junk yards in areas adjacent to the interstate, primary, and secondary systems within this state and other roads maintained by the state. The legislature finds and declares that junk yards that do not conform to the requirements of this chapter are public nuisances.