SCROLL-X combines a flexible light guide, electronic paper display, and laser projection technology to reduce the risk of placing an emergency stop sign when a vehicle breaks down during daytime or night time. The reel design can be installed in the trunk, allowing users to quickly open the Scroll-X after opening the trunk, and it automatically activates the enlarged vehicle breakdown message; combining with the projection of laser dynamic lane shifting indication several meters behind the breakdown vehicle. The approaching cars can clearly identify the warning from a distance to improve the c