A vehicle tail light operational indicator is mounted to a vehicle tail light to visually communicate the proper operation of turn signals, tail lights, and brake lights to an operator seated in the driver's seat of a motor vehicle. The vehicle tail light operational indicator comprises a reflecting light bar positioned to be viewable in a side view mirror of the vehicle. The vehicle tail light operational indicator further comprises a pair of base anchors that are adhesively attached to a vehicle tail light and which support the light bar. Each base anchor further includes a hinge and threaded adjuster which allows adjustment of the vehicle tail light operational indicator on various tail light designs as well as allowing the vehicle tail light operational indicator to pivot without damage if accidentally struck by an object while driving.