S5.5.11(a) Any pair of lamps on the front of a passenger car, multipurpose passenger vehicle, truck, or bus, whether or not required by this standard, other than parking lamps or fog lamps, may be wired to be automatically activated, as determined by the manufacturer of the vehicle, in a steady burning state as daytime running lamps (DRLs) and to be automatically deactivated when the headlamp control is in any ``on'' position, and as otherwise determined by the manufacturer of the vehicle, provided that each such lamp:
(1) Has a luminous intensity not less than 500 candela at test point H-V, nor more than 3,000 candela at any location in the beam, when tested in accordance with Section S11 of this standard, unless it is:
(i) A lower beam headlamp intended to operate as a DRL at full voltage, or at a voltage lower than used to operate it as a lower beam headlamp; or
(ii) An upper beam headlamp intended to operate as a DRL, whose luminous intensity at test point H-V is not more than 7,000 candela, and which is mounted not higher than 864 mm above the road surface as measured from the center of the lamp with the vehicle at curb weight;
(2) Is permanently marked ``DRL'' on its lens in letters not less than 3 mm high, unless it is optically combined with a headlamp;
(3) Is designed to provide the same color as the other lamp in the pair, and that is one of the following colors as defined in SAE Standard J578 MAY88: White, white to yellow, white to selective yellow, selective yellow, or yellow;
(4) If not optically combined with a turn signal lamp, is located so that the distance from its lighted edge to the optical center of the nearest turn signal lamp is not less than 100 mm, unless:
(i) The luminous intensity of the DRL is not more than 2,600 candela at any location in the beam and the turn signal meets the requirements of S5.3.1.7; or
(ii) (For a passenger car, multipurpose passenger vehicle, truck, or bus that is manufactured before October 1, 1995, and which uses an upper beam headlamp as a DRL as specified in paragraph S5.5.11(a (1)(ii)) the
luminous intensity of the DRL is greater than 2,600 candela at any location in the beam and the turn signal lamp meets the requirements of S5.3.1.7; or
(iii) The DRL is optically combined with a lower beam headlamp and the turn signal lamp meets the requirements of S5.3.1.7; or
(iv) The DRL is deactivated when the turn signal or hazard warning signal lamp is activated.
(5) If optically combined with a turn signal lamp, is automatically deactivated as a DRL when the turn signal lamp or hazard warning lamp is activated, and automatically reactivated as a DRL when the turn signal lamp or hazard warning lamp is deactivated.