Interpretation ID: 1985-02.47

TYPE: INTERPRETATION-NHTSA

DATE: 06/24/85

FROM: AUTHOR UNAVAILABLE; Jeffrey R. Miller; NHTSA

TO: Mr. L. D. Pitts, Jr.

TITLE: FMVSS INTERPRETATION

TEXT:

Mr. L. D. Pitts, Jr P. O. Box 52592 Houston, Texas 77002

Thank you for your letter of March 12, 1985, asking about the effect of our regulations on a product you would like to manufacture. I hope the following discussion explains that effect.

You described your product, which you call a glare-shield, as a 1/8-inch thick sheet of "Lexan" plastic with a special scratch resistant coating. Your product is designed to be mounted inside a motor vehicle, as close to the windshield as possible, to reduce glare-related vision problems caused by the sun. You stated that your product would cover the entire windshield and is designed to be held in place by three or six latches. The latches can be released by the driver and the shield can be removed from the car.

Pursuant to the National Traffic and Motor Vehicle Safety Act, we have issued Federal Motor Vehicle Safety Standard No. 205, Glazing Materials, (49 CFR 571.205) which specifies performance and location requirements for glazing used in vehicles. These requirements include specifications for minimum levels of light transmittance (70% in areas requisite for driving visibility, which includes all windows in passenger cars).

Any manufacturer, dealer or other person who installs tinting films or other sun screen devices, such as the one described in your letter, in new vehicles must certify that the vehicle as altered continues to comply with the requirements of the standard. Thus, for example, the light transmittance through the combination of the sun-screening material and the glazing must be at least 70 percent in the case of glazing used in windows requisite for driving visibility. Similarly, the combination must also meet the other applicable requirements of the standard, such as the abrasion resistance requirements.

After a vehicle is sold to the consumer, owners may themselves alter their vehicles as they please, so long as they adhere to all State requirements. Under Federal law, an owner may install any device regardless of whether the installation adversely affects light transmittance. The agency does, however, urge owners not to install equipment which would render inoperative the compliance of a vehicle with our standards. Individual States govern the operational use of vehicles by their owners and therefore it is within the authority of the States to preclude owners from using sun screens on their vehicles.

If a manufacturer, dealer, distributor or motor vehicle repair business installs the sun screen device for the owner of a used vehicle, then S108(a)(2)(A) of the Vehicle Safety Act may apply. That section provides that none of those persons may knowingly render inoperative any device or element of design installed on or in a motor vehicle or item of motor vehicle equipment in compliance with a Federal motor vehicle safety standard. Violation of the "render inoperative" provision can result in Federal civil penalties of up to $1,000 for each violation.

Sincerely,

Jeffrey R. Miller Chief Counsel

P. O. Box 52592 Houston Texas 77002 March 12, 1985

Mr. George Berndt, Chief Counsel Office of the Chief Counsel National Highway Traffic Safety Administration 400 7th Street, S.W. Washington, D.C., 20590

Dear Mr. Berndt:

I am writing about a product that I would like to manufacture and market in the United States. Since the product is for use on vehicles being driven on public roads, I respectfully request your comments as to whether or not you think the product is in compliance with the laws as they are now written.

The product name is glare-shield. Its' purpose is to reduce motor vehicle accidents. It functions on the same principal as do sunglasses. except it has several advantages over sunglasses. Some people have vision defects for which prescription sunglasses cannot be made. Other people would prefer a glare-shield rather than sunglasses because of the fatigue caused by the physical discomfort of the sunglasses while being worn.

A glare--shield is made from a 1/8" thick sheet of "Lexan" plastic with a special scratch resistant coating. It is the same plastic manufactured by the General Electric Company and known as MR-50T4. Lexan MR-50T4 sheeting has been successfully tested for compliance with FMVSS-217 by bus manufacturers (A.M. General Corporation, General Motor Truck and Coach and Flxible/Rohr). MR-50T4 is approved by the American Association of Motor Vehicle Administrators. MR-50T4 meets or exceeds the requirements of items 4 and 5 of FMVSS-205.

A glare-shield can come in either one or two pieces, depending on the vehicle. A glare-shield is large enough in size to cover the entire area of the windshield of the vehicle it was designed to fit. A glare-shield is mounted on the inside of the vehicle as close to the windshield as possible. It is mounted in such a position that it does not interfere with the defroster device and can actually aid in its' operation, by directing more air toward the windshield. A glare-shield is not a permanent installation and can be removed for night driving in less than ten (10) seconds. Three or six stainless steel latches are used to hold the glare-shield in place. depending on whether it is a one or two piece unit. These latches are separately and permanently mounted to the vehicle using stainless steel rivets and rubber washers. Each latch has been designed to support the full weight of the glare-shield, should the other two latches not be functioning for some unknown reason. The latches cannot be accidentally opened by vibration, because they are mounted in rubber. Stainless steel sheet metal guards are attached to the edge of the glare-shield in the area where the latches make contact, in order to prevent damage to the coating on the Lexan. A vinyl molding is glued around the edge of the glareshield, to prevent the "Lexan" from coming in contact with any hard surface of the vehicle which could cause rattling from road vibration. The light transmission of various glare-shields will be equal to the various shades obtained from sunglasses found on the market today. The driver will decide which light transmission percentage is best for him, just as he now does when choosing sunglasses.

The main function of a glare-shield is to reduce the blinding glare from the sun at both sun-up and sun-down. The second important function is to reduce driver fatigue caused by reflections of shiny surfaces on a sunny day. An added benefit of using glare-shield is that windshields will no longer be tinted on their top part, or lightly tinted all over, which is a common practice today to reduce daytime glare. This tinting of windshields is bad, of course, because it reduces the driver's visibility at night. Another advantage of a glare-shield is that in the event of an accident, it will keep the driver's and passenger's heads from coming in contact with the windshield which usually results in facial lacerations. The glare-shield also helps in preventing a body being thrown through the windshield. The last advantage of a glare-shield, is that it acts as a protective shield against windshield glass fragments and foreign objects which strike and may penetrate the windshield.

Your immediate attention is requested on this project, as it appears to all those who have heard about glare-shields that they can reduce the number of accidents, and reduce bodily injuries and deaths, when accidents do occur.

Sincerely yours, L. D. Pitts, Jr. LDP/bjs