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. Scroll-X can be used with mobile device APP, which is widely used for temporary stop of bus and ambulance, police car pull-over stop, road construction and cleaning, etc. With the driving lens, the front view of the large vehicle can be displayed for the approaching cars to let the approaching vehicles know the condition of the preceding vehicle.