Alaska Statutes Title 11. Criminal Law § 11.61.150. Obstruction of highways

(1) places, drops, or permits to drop on a highway any substance that creates a substantial risk of physical injury to others using the highway; or

(2) renders a highway impassable or passable only with unreasonable inconvenience or hazard.

(1) the defendant took reasonable steps to remove the substance from the highway; and

(2) no person suffered physical injury as a result of the presence of the substance on the highway.