Wisconsin: Division of State Patrol, Madison, WI. 608-266- 3212.
348.10, Section 2. Special limitations on load.
(2) No person shall operate a vehicle on a highway unless such vehicle is so constructed and loaded as to prevent its contents from dropping, sifting, leaking or otherwise escaping therefrom.
346.94, Section 7. Spilling loads of waste or foreign matter.
(7) The operator of every vehicle transporting waste or foreign matter on the highways of this State shall provide adequate facilities to prevent such waste or foreign matter from spilling on or along the highways.