Interpretation ID: nht88-2.48

TYPE: INTERPRETATION-NHTSA

DATE: 06/10/88

FROM: T. BAILEY -- LEGISLATION ENGINEER, INTERNATIONAL AUTOMOTIVE DESIGN

TO: NHTSA

TITLE: FMVSS 104 Windshield WIPING & WASHING SYTEMS

ATTACHMT: MEMO DATED 11-3-88, TO T.P. BAILEY, FROM ERIKA Z. JONES, STD. 104

TEXT: As an automotive design consultancy we need a clear understanding of this Standard, particularly the requirements of paragraph S4.1.2, Wiped Area. We have a problem with this and would appreciate some advice.

Firstly, can you confirm this paragraph is only applicable to passenger cars.

Secondly, the hypothetical results for a windscreen are shown on attachment 1. In this, Area A on one side extends to the DLO, on the other, overlaps it. (The DLO is taken to start at the inner edge of the obscuration band). As drawn, the correct perce ntage wiped area is still achieved. Should Area A be wholly:-

1. On exterior surface of glass, inside a perimeter line drawn one inch from edge of daylight opening.

2. On exterior surface of glass, inside the DLO.

3. On exterior surface of glass (ie. whole surface visible from outside vehicle including the obscuration band).

4. On total exterior surface of glass (ie. including the part normally hidden under trim and mouldings).

Thank you for your attention. I look forward to hearing from you.

See Illumtation on original