A system for generating a display image having multiple image display columns comprising a first image display column and a second image column for viewing by a viewer in motion in a variable vehicle speed environment, the system comprising: a display unit having a vertical column of energizable light elements, each row of the column having at least one energizable light element, the display unit being configured for being positioned adjacent to a pathway used by a moving vehicle; and a controller configured for: • receiving a variable speed of the vehicle, including a first speed and a second speed; • generating first display parameters based on the first of the vehicle speed for at least one row element in the first image display column of the multiple image display columns; • receiving a second vehicle speed different from the first vehicle speed; • generating second display parameters based on the second vehicle speed for at least one row element in the second image display column of the multiple image display columns; and • transmitting the first and second display parameters to the display unit; wherein the display unit is configured for generating the display image based on the first and second display parameters such that the first image display column and the second image display column of the display image are both to be generated sequentially from the same column of energizable light elements, wherein the first image display column and the second image display column are configured to be aggregated by the human visual system to build a single display image; where the display parameters include any of what time to start to energize/activate the energizing elements, what duration to energize/activate the energizing elements, variability of colour and brightness to display the image, activation frequency and/or frame rate. a display unit having a vertical column of energizable light elements, each row of the column having at least one energizable light element, the display unit being configured for being positioned adjacent to a pathway used by a moving vehicle; and a controller configured for: • receiving a variable speed of the vehicle, including a first speed and a second speed; • generating first display parameters based on the first of the vehicle speed for at least one row element in the first image display column of the multiple image display columns; • receiving a second vehicle speed different from the first vehicle speed; • generating second display parameters based on the second vehicle speed for at least one row element in the second image display column of the multiple image display columns; and • transmitting the first and second display parameters to the display unit; • receiving a variable speed of the vehicle, including a first speed and a second speed; • generating first display parameters based on the first of the vehicle speed for at least one row element in the first image display column of the multiple image display columns; • receiving a second vehicle speed different from the first vehicle speed; • generating second display parameters based on the second vehicle speed for at least one row element in the second image display column of the multiple image display columns; and • transmitting the first and second display parameters to the display unit; wherein the display unit is configured for generating the display image based on the first and second display parameters such that the first image display column and the second image display column of the display image are both to be generated sequentially from the same column of energizable light elements, wherein the first image display column and the second image display column are configured to be aggregated by the human visual system to build a single display image; where the display parameters include any of what time to start to energize/activate the energizing elements, what duration to energize/activate the energizing elements, variability of colour and brightness to display the image, activation frequency and/or frame rate.