Vehicle HUD with external screen projection

A computing device, e.g., in a vehicle, can receive a communication trigger for a heads-up display (HUD) in a vehicle to project light external to a vehicle. The device can then identify a projection parameter to visibly project the light external to the vehicle, e.g., beyond a viewing area on a projection screen in or on the vehicle, and can then cause the HUD to project the light from the HUD to be visible external to the vehicle in response to the communication trigger.