Idaho Code § 49-612: Obstruction to driver’s view or driving mechanism.

(1) No person shall drive a vehicle when it is so loaded or when there are in the front seat a number of persons exceeding three (3), as to obstruct the view of the driver to the front or the sides of the vehicle, or as to interfere with the driver’s control over the driving mechanism of the vehicle.

(2) No passenger in a vehicle shall ride in a position as to interfere with the driver’s view ahead or to the sides, or to interfere with his control of the driving mechanism of the vehicle.

(3) No vehicle shall be operated when the windshield and/or windows of the vehicle are coated with ice, snow, sleet, or dust to the extent that the driver’s view ahead, or to the sides or rear of the vehicle are obstructed.