This SAE Standard provides test procedures, requirements, and guidelines for a daytime running light (DRL) function.
6.9.5 Installation Requirement There shall only be one DRLF per vehicle. This shall be made up of one pair of lamps, one on each side of the front of the vehicle, facing to the front. There shall only be one DRLF per vehicle. DRLs shall be mounted symmetrically about the vehicle centerline facing to the front. The cumulative DRLs per side shall comply with the photometric requirements.