That hacked electronic roadside display in Brooklyn said cars are bad, which startlingly brings up questions about the advent of AI self-driving cars

Right lane closed ahead.

Or sometimes it is stated as RIGHT LANE CLOSED AHEAD.

That’s what you often see displayed on those official roadside electronic displays.

https://www.forbes.com/sites/lanceeliot/2021/06/28/that-hacked-electronic-roadside-display-in-brooklyn-said-cars-are-bad-which-startlingly-brings-up-questions-about-the-advent-of-ai-self-driving-cars/