A. A person who commits or causes to be committed any of the following acts is guilty of a petty offense:

1. 1. Places or maintains an encroachment or obstruction on, makes any use of or otherwise occupies a public highway or airport of this state or any of its political subdivisions for any purpose other than for authorized public travel, communication, transportation or transmission, except as otherwise provided in this section.

2. 2. Places or maintains an encroachment or obstruction on, uses, occupies, damages or otherwise interferes with a public highway, airport or public bridge, causeway, viaduct, trestle or dam, unless either:

   1. (a) Authorized by the director, if it is a state highway or structure or airport facility.
   2. (b) Authorized by the governing body of the political subdivision in which the act is committed, if it is not a state highway or structure or airport facility.
3. 3. Knowingly molests or destroys any part, projection, structure, appurtenance or accessory of a public highway or airport or destroys or otherwise interferes with a drainage ditch constructed for the protection of a public highway or airport or a dike, ditch, levee or jetty or an embankment appurtenant to a drainage ditch constructed for the protection of a public highway or airport.
4. 4. Knowingly destroys or interferes with a ford, dip, culvert or crossing of a creek, gulch, river or stream by digging away the banks or by damming, deepening or widening a creek, gulch, river or stream to divert waters on the public highway or airport or to cause injury or damage to the public highway or airport by flooding or otherwise.
5. 5. Knowingly places or maintains a vehicle, aircraft or structure parked or placed wholly or partly within a public highway, runway or taxiway specifically for the purpose of selling the vehicle, aircraft or structure or of selling or specifically advertising the sale of, at any location, an article, service or thing.
6. 6. Knowingly stores, services, repairs or otherwise works on a vehicle wholly or partly within a highway other than on a vehicle that is temporarily disabled.
7. 7. Knowingly removes, damages or destroys a tree or shrub standing on a highway right-of-way.
8. 8. Knowingly obstructs or injures a public highway, runway or taxiway by causing or permitting flow or seepage of water under the person's control to escape onto the highway, runway or taxiway.

D. This section does not apply to:

1. 1. Department personnel or agents performing normal construction and maintenance functions.
2. 2. A person who has prior authorization in writing from the director to perform any of the acts referred to in this section.