Abstract: A motor vehicle alerting bright light dimming message display system for requesting a driver of a vehicle behind the vehicle displaying the message to dim his bright lights. The message display system improves vehicle safety and promotes driver courtesy. The message display system may include an LED or LCD display at the rear of a vehicle and a control circuit for operating the display. In one aspect of the invention, the display is automatically activated by a bright light from a trailing vehicle. The digital message display for vehicles detects a bright light intensity exceeding a threshold and automatically displays a request, directed to the driver of the trailing vehicle, to dim lights. The display may also be configured to display advertising, emergency and other messages.