The Auto Rack Light is a tail light extension system for hauling bikes
Cycle Fun Montreal: Why do bike tail-lights not attach to bike racks?
BNB Bikerack Lightboard/License Holder E-Bikes and Mobility
Witter UK on X: "Are your bikes covering your brake lights when your # bikerack is loaded? Not to worry, as all of them come with additional lights. #Witter Pure Instinct bike rack -