(A) No person shall drive a vehicle when it is so loaded, or when there are in the front seat such number of persons, exceeding three, as to obstruct the view of the driver to the front or sides of the vehicle, or as to interfere with the driver's control over the driving mechanism of the vehicle.
(B) No passenger in a vehicle or streetcar shall ride in a position as to interfere with the driver's or motorman's view ahead or to the sides, or to interfere with his or her control over the driving mechanism of the vehicle or streetcar.
(C) No passenger on a school bus may ride or stand in a position as to interfere with the driver's view ahead or to the side or to the rear, or to interfere with his or her control of the driving mechanism of the bus.
(ILCS Ch. 625, Act 5, § 11-1406) Penalty, see § 71.999