Interpretation ID: 20061.ztv

Mr. Mark Cronmiller
Project Engineer
VDO North America LLC
2669 Bond Street
Rochester Hills, MI 48309

Dear Mr. Cronmiller:

This is in reply to your email of May 14, 1999, with respect to "smart" headlight systems.

You report that these systems adjust headlamp aim vertically and/or horizontally according to driving conditions (e.g., vertically for oncoming traffic, horizontally around curves in the road). You ask whether there are any regulation interpretations relating to these systems, and whether we have plans to regulate or require these types of systems.

We have not issued any interpretations on these new "smart" headlamp systems. Federal Motor Vehicle Safety Standard No. 108 Lamps, Reflective Devices and Associated Equipment, prescribes headlamp aiming hardware requirements under static conditions only (paragraph S7.8). Once a headlamp is installed on a vehicle, its aim is fixed, but may be adjustable by mechanical means when the vehicle is at rest. A limited ability to adjust vertical aim on some vehicles is also provided by vehicle leveling devices. Our standard does not require that headlamps be aimed at the time the vehicle is manufactured and certified as conforming to all applicable Federal motor vehicle safety standards. If there is a requirement for correct headlamp aim on new vehicles, it would be that of a State's motor vehicle authority at the time the vehicle is first registered for highway use in that State.

If a "smart" headlamp system meets the static aiming hardware requirements of Standard No. 108, a dynamic aiming feature is permissible. We have no specific plans to regulate or require headlamps with dynamic aim features, but we are monitoring them to form an impression as to their suitability for use under American driving conditions, and to learn if there are any problems of maintenance of aiming integrity, or durability, involved in their use. At a minimum, we would be concerned about the need for fail-safe performance to assure that aim would return to nominally correct, straight ahead in the event of a failure.

Because each State is likely to impose aim-location requirements on new motor vehicles and these requirements may differ from State to State, we note that you may have difficulty getting a "smart" headlamp system accepted as capable of being correctly aimed as may be required by the various States. We recommend that you contact the American Association of Motor Vehicle Administrators (AAMVA) for determining the legality of the "smart" headlamp system under each State's laws pertaining to correct headlamp aim. AAMVA's address is 4600 Wilson Boulevard, Arlington, VA 22203.

If you have further questions, you may call Taylor Vinson of this Office (202-366-5263)

Sincerely,
Frank Seales, Jr.
Chief Counsel
ref:108
d.7/21/99