It will only turn blue if the vehicle is moving rapidly towards you. If it is moving away, it will become invisible infrared.
A related comment: Click and Clack, the Tappet Brothers (from cars.com and npr) have posed the following question: We know what the speed of light is. But what is the speed of **dark**?
It will only turn blue if the vehicle is moving rapidly towards you. If it is moving away, it will become invisible infrared.
A related comment: Click and Clack, the Tappet Brothers (from cars.com and npr) have posed the following question: We know what the speed of light is. But what is the speed of **dark**?