Interpretation ID: aiam1008
1651 E. Nine Mile Road
Hazel Park
Michigan 48030;
Dear Mr. Hawes: This is in response to your petition for amendment of Standard 125 (4 CFR S571.125), *Warning Devices*, dated January 31, 1973. You requested that the standard be amended to make it mandatory for all warning devices to have the capability of being mounted on a vehicle roof as well as on the ground. At present the standard allows such a capability, but does not require it.; The NHTSA has not found it advisable to amend the standard as you hav requested. The requirements that have been issued are intended to provide for simple, inexpensive devices that have a uniform method of use, namely setting on the roadway in the direction of oncoming traffic. Any requirements that call for multiple uses and capabilities will tend to make the device for more complex and expensive. If persons are willing to pay extra for capabilities such as roof mounting, that is, if there is a market, then you will perform in these ways. There are many vehicles, however, for which roof mounting would not be feasible in any circumstances. The information that we have received to date on this subject does not justify imposing on all manufactures the additional requirements that you suggest.; For these reasons your petition for rulemaking to amend Standard 125 i denied.; Sincerely, Douglas W. Toms, Administrator