Texas Transportation Code - TRANSP § 547.355. Visibility Requirements

(a) A clearance lamp, identification lamp, or side marker lamp shall be visible and recognizable under normal atmospheric conditions at all distances from 50 to 500 feet from the vehicle on the side, front, or rear where the lamp is mounted.

(b) A reflector required by this chapter mounted on a vehicle subject to this subchapter shall be visible from the rear, if a rear reflector, or from the applicable side, if a side reflector, at nighttime at all distances from 100 to 600 feet from the vehicle when the reflector is directly in front of: