A display sign is for a central reservation barrier in some examples. It has a base to engage a barrier in a manner which envelopes the top surface and downwardly on the opposed side walls. A display with display elements provides information for drivers, and a display drive apparatus is mounted to the base and rotates the display about a vertical axis extending from the base. The drives can have a very low profile, with components being offset with respect to the display longitudinal axis. The drive provides that the display is aligned with a barrier in use when not required but is turned to an optimal angle for visibility by drivers according to the driving conditions. The drive brings the display back to the default in operative position when there is a power outage.