Wis. Stat. § 86.01: Materials left in highway; penalty.

It shall be unlawful for any highway superintendent or any other person to leave any materials in the traveled portion of any highway not closed to public travel in piles or rows after sunset without placing within one hour after sunset upon such piles or at the end of such rows a lighted lantern containing sufficient oil or fuel to keep the same burning until daylight. Any person violating any of the provisions of this section shall be liable to a fine of not less than $10 nor more than $100.