(b) All signs or markers shall be erected at the expense of the state or municipality, provided, however, that the municipality may accept funds or contributions therefor from private persons, clubs or associations interested in the promotion of ATVs. 4. Any regulation, order, local law or ordinance which designates a highway or portion thereof or designated lands which may be used for ATV operations may include rules and impose restrictions and conditions for the regulation and safe operation of ATVs on the highways and lands so designated, such as travel on designated trails and hours of operation. Any restriction or condition not contained in this chapter must be posted. 5. Copies of orders, regulations, local laws or ordinances adopted by governmental agencies pursuant to this section shall be filed with the commissioner.