Interpretation ID: 21937.drn
Jiri Misik, Chief
Type Approval Tests and Technical Regulations
SKODA, automobilov a.s.
Vslava Klementa 869
Cesk Republika (Czech Republic)
Dear Mr. Misik:
This responds to your request for information about "US field of vision" requirements for motor vehicle windshields for passenger cars and light duty vehicles. As explained below, the United States has no forward field of view standard for these vehicles.
In your letter, you noted that Federal Motor Vehicle Safety Standard No. 104, Windshield wiping and washing systems, describes Areas "A," "B" and "C" to be cleared in motor vehicle windshields. In contrast you noted that in Europe:
In our case the edge of area "A" and "B" ... is not placed on the windshield but on the steel structure or even on the side window. This case is not mentioned in any US legislation which is related directly to wipe, wash and forward vision, anyway. Forward field of vision is only clearly defined in European Directive 77/649 and Australian ADR 8, clause 8.3.
With this background, you ask whether "there is a mandatory US provision to place the edge of 'A' area on the windscreen with regard to forward field of vision."
In response to your question, no provision in the U.S. Federal Motor Vehicle Safety Standards specifies forward field of view requirements for vehicles other than school buses. As you note, we have Standard No. 104, which establishes requirements for motor vehicle windshield wiping and washing systems. Since Standard No. 104 regulates windshield wiper performance, it defines each of Areas "A," "B" and "C" so that only the part of each Area that is within the glazing 25 millimeters inboard of the daylight opening is counted for the computation of the minimum cleared percentage. Please note that these are requirements for areas of the motor vehicle windshield to be cleared of water or other liquids. We have no standard analogous to EU Directive 77/649 which would use Areas "A," "B" and "C" to specify areas of mandatory forward fields of view.
Another indication that Standard No. 104 does not specify forward fields of vision is seen in the fact that there is no requirement that Area "A," as bounded by the angles specified in Tables I, II, III or IV, must be completely included on the windshield glazing.
I hope this information is helpful. If you have any further questions, please contact Dorothy Nakama of my staff at this address or at (202) 366-2992. Our FAX number is (202) 366-3820.
Sincerely,
Frank Seales, Jr.
Chief Counsel
ref:104
d.10/5/00