AS 11.61.150: Obstruction of highways.

(a) A person commits the offense of obstruction of highways if the person knowingly

(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.

(b) It is an affirmative defense to a prosecution under (a)(1) of this section that

(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.

(c) Obstruction of highways is a violation punishable by a fine of not more than $1,000.