Colorado Code § 42-4-227

Windows unobstructed - certain materials prohibited - windshield wiper requirements
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(1) (a) (I) Except as otherwise provided in this paragraph (a), no person shall
operate a motor vehicle registered in Colorado on which any window, except the windshield, is
composed of, covered by, or treated with any material or component that presents an opaque,
nontransparent, or metallic or mirrored appearance in such a way that it allows less than twenty-
seven percent light transmittance. The windshield shall allow at least seventy percent light
transmittance.
(II) Notwithstanding subparagraph (I) of this paragraph (a), the windows to the rear of
the driver, including the rear window, may allow less than twenty-seven percent light
transmittance if the front side windows and the windshield on such vehicles allow at least
seventy percent light transmittance.
(III) A law enforcement vehicle may have its windows, except the windshield, treated in
such a manner so as to allow less than twenty-seven percent light transmittance only for the
purpose of providing a valid law enforcement service. A law enforcement vehicle with such
window treatment shall not be used for any traffic law enforcement operations, including
operations concerning any offense in this article. For purposes of this subparagraph (III), "law
enforcement vehicle" means a vehicle owned or leased by a state or local law enforcement
agency. The treatment of the windshield of a law enforcement vehicle is subject to the limits
described in paragraph (b) of this subsection (1).
(b) Notwithstanding any provision of paragraph (a) of this subsection (1), nontransparent
material may be applied, installed, or affixed to the topmost portion of the windshield subject to
the following:
(I) The bottom edge of the material extends no more than four inches measured from the
top of the windshield down;
(II) The material is not red or amber in color, nor does it affect perception of primary
colors or otherwise distort vision or contain lettering that distorts or obstructs vision;
(III) The material does not reflect sunlight or headlight glare into the eyes of occupants
of oncoming or preceding vehicles to any greater extent than the windshield without the
material.
(c) Nothing in this subsection (1) shall be construed to prevent the use of any window
which is composed of, covered by, or treated with any material or component in a manner
approved by federal statute or regulation if such window was included as a component part of a
vehicle at the time of the vehicle manufacture, or the replacement of any such window by such
covering which meets such guidelines.
(d) No material shall be used on any window in the motor vehicle that presents a
metallic or mirrored appearance.
(e) Nothing in this subsection (1) shall be construed to deny or prevent the use of
certificates or other papers which do not obstruct the view of the driver and which may be
required by law to be displayed.
(2) The windshield on every motor vehicle shall be equipped with a device for cleaning
rain, snow, or other moisture from the windshield, which device shall be so constructed as to be
controlled or operated by the driver of the vehicle.
(3) (a) Except as provided in paragraph (b) of this subsection (3), any person who
violates any provision of this section commits a class B traffic infraction.
(b) Any person who installs, covers, or treats a windshield or window so that the
windshield or window does not meet the requirements of subsection (1)(a) of this section
commits a class A traffic infraction.
(4) This section shall apply to all motor vehicles; except that subsection (2) of this
section shall not apply to low-speed electric vehicles.

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